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15</span></p><p class="elsevierStylePara">HCV seroprevalence in health care workers is three fold higher than that in workers in other industries&#46; Thus&#44; health care workers in dialysis centers are a special risk group for acquiring the virus&#46;<span class="elsevierStyleSup">16&#44; 17</span></p><p class="elsevierStylePara">The Brazilian population-based studies on HCV seroprevalence still are scant&#46; An HCV seroprevalence of 1&#46;42&#37; was shown in 1059 healthy individuals<span class="elsevierStyleSup">18</span> and of 1&#46;7&#37; in 119 healthy individuals from an indigenous population&#46;<span class="elsevierStyleSup">19</span> In MG&#44; there are no consistent data so far on HCV seroprevalence in the general population&#46;</p><p class="elsevierStylePara">The goals of this study were&#58; to evaluate the frequency of HCV seroprevalence in patients with stage V CRD on HD program in the hemodialysis centers of the State of MG in Southeast Brazil&#59; to correlate this seroprevalence with the time on HD therapy&#59; to investigate the HCV seroprevalence in health care workers of these hemodialysis centers&#59; and to verify whether there exists a correlation between the average HCV seroprevalence of dialysis centers and HDI from the&#160; different regions of the State of MG&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">PARTICIPANTS AND METHODS</span></p><p class="elsevierStylePara">Study design&#58; This is a multicenter cross-sectional epidemiological study carried out in the period January to December of 2003 among the hemodialysis centers of the State of MG in the Southeast region of Brazil&#44; where the health care status in relation to HCV infection was investigated among individuals with stage V CRD on HD program and among health care workers&#46;</p><p class="elsevierStylePara">Subjects&#46; Inclusion criteria&#58; hemodialysis centers giving their consent to participate in the study on HCV seroprevalence with serological control by means of the anti-HCV ELISA III assay in HD patients and health care workers&#44; by filling-up a validated questionnaire&#46; After their consent&#44; 66 &#40;92&#37;&#41; hemodialysis centers out of a total of 72 were included into the study&#46; Of the six centers excluded&#44; one did not answer the questionnaire and five had not available the full monthly data on&#160; anti- HCV serology of the HD patients&#46; Also included into the study were those hemodialysis centers starting their services in the year 2003 provided that they had solid data corresponding to the subsequent months during the study period&#46; In these cases&#44; the information taken into account was that from the time they started their services&#46;</p><p class="elsevierStylePara">Methods&#58;We applied a previously designed&#44; tested&#44; and validated questionnaire exclusively of the purpose of this study&#46; The Health Secretary&#191;s Office of the State of MG &#40;HSOSMG&#41; offered its database for an eventual consultation&#46; The HDI values were obtained from the Human Development Atlas&#46;<span class="elsevierStyleSup">20</span> The monthly HCV seroprevalence of the municipalities and geographical regions of the State of MG was calculated by dividing the number of patients with positive anti-HCV serology by the total number of patients submitted to HD per month at the hemodialysis centers&#46; In order to calculate the frequency of HCV seroprevalence among health care workers we used the same methodology&#46;</p><p class="elsevierStylePara">Measurements&#58; The primary outcome variable was the serology of anti-HCV ELISA III antibodies performed monthly in CRD patients on HD at the hemodialysis centers included&#46; The secondary outcomes variables were the demographical data of the patients&#58; age&#44; gender&#44; etiology of renal disease&#44; time on HD&#44; serology of anti-HCV ELISA III antibodies among health care workers&#44; frequency of HCV seroprevalence in the hemodialysis centers of the municipalities of one region and mean regional HDI&#46;</p><p class="elsevierStylePara">Statistical analysis&#58; The information gathered in the questionnaires was digitalized in a database developed with Microsoft Access version 2000 software&#46; We established the mean annual HCV seroprevalence as the response variable&#46; The descriptive data were obtained from the frequency of the characteristics of the different variables&#46; In order to compare the mean regional HDI and the monthly average of the frequency of regional HCV seroprevalence&#44; and continuous variables we used the Pearson&#191;s correlation coefficient &#40;r&#41;&#46; This coefficient provides the level of the strength of the linear relationship between two continuous variables&#44; and varies from&#191;1 to &#43;1&#44; including the naught value&#46; The r<span class="elsevierStyleSup">2</span> value is the proportion of the mean standard variation and that explained by x &#40;or vice versa&#41;&#46; The level of statistical significance was established at 0&#46;05 with a statistical power of 80&#37;&#46;<span class="elsevierStyleSup">21</span></p><p class="elsevierStylePara">Ethical issues&#58; The investigation project was approved by the Ethical and Investigation Committee of the Federal University of Minas Gerais &#40;UFMG&#41;&#44; complying with the 196&#47;96 Resolution of the National Health Council&#44; which establishes the rules for investigations on human beings&#46;<span class="elsevierStyleSup">22</span> Besides&#44; we sent explanatory letters on the investigation project to the HSOSMG&#44; the Brazilian Society of Nephrology &#40;SBN&#41;&#44; the National Association of Kidney Donors and Transplanted Patients &#40;Associa&#231;&#227;o Nacional dos Doadores e Transplantados Renais &#40;DORETRANS&#41;&#44; and to the hemodialysis centers of the State of MG&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">RESULTS</span></p><p class="elsevierStylePara">Descriptive study&#58; By December of 2003&#44; 7636 patients with stage V CRD were on a HD program in the 66 hemodialysis centers of the State of MG&#44; Southeast Brazil&#46; Of them&#44; 4&#44;290 &#40;56&#46;2&#37;&#41; were males and 3346 &#40;43&#46;8&#37;&#41; were females&#46; About their age&#44; 265 &#40;3&#46;5&#37;&#41; patients had 0-20 years&#44; 647 &#40;8&#46;5&#37;&#41; 21-30 years&#44; 1&#44;154 &#40;15&#46;0&#37;&#41; 31-40 years&#44; 1&#44;819 &#40;23&#46;8&#37;&#41; 41-50 years&#44; 1&#44;654 &#40;21&#46;7&#37;&#41; 51-60 years&#44; 1259 &#40;16&#46;5&#37;&#41; 61-70 years&#44; and 838 &#40;11&#46;0&#37;&#41; more than 70 years&#46; There was a preponderance of the male gender in all age groups &#40;table I&#41;&#46;</p><p class="elsevierStylePara">The most common etiologies of CRD were arterial hypertension &#40;30&#37;&#41;&#44; chronic glomerulonephritis &#40;24&#37;&#41;&#44; and diabetic nephropathy &#40;20&#37;&#41;&#46; The sample loss was 10&#37;&#46; The mean number of patients in the six centers excluded &#40;83 &#177; 29&#41; was similar to the mean number of patients in the centers included &#40;101 &#177; 59&#41;&#46; There were no statistically significant differences &#40;p &#61; 0&#46;46&#41;&#46; The number of hemodialysis centers by each region of the State of MG and the quarterly seroprevalence results of HCV infection are shown in table II&#46;</p><p class="elsevierStylePara">The mean quarterly seroprevalence of HCV infection in the State of MG was 13 &#177; 9&#37;&#46; The lowest HCV seroprevalence was found in the region of Vale do Jequitinhonha and the highest in the southeastern region of the State&#46; The quarterly seroprevalence of HCV infection in the 66 hemodialysis centers of MG was lower than 20&#37;&#44; 15&#37;&#44; and 10&#37; in 75&#37;&#44; 50&#37;&#44; and 40&#37; of the hemodialysis centers&#44; respectively&#44; as shown in figure 1&#46;</p><p class="elsevierStylePara">The 66 hemodialysis centers were pooled in five frequency intervals of HCV infection seroprevalence&#44; considering the average HCV infection seroprevalence &#40;&#8804; 10&#37;&#44; 11&#37;-20&#37;&#44; 21&#37;-30&#37;&#44; 31&#37;-40&#37;&#44; and 41&#37;-50&#37;&#41;&#46; Only two hemodialysis centers were included within the interval 41&#37;-50&#37;&#44; being one in the Southeast region and the other one in the region of Tri&#226;ngulo do Norte&#46; No hemodialysis centers were included in the interval 31&#37;-40&#37;&#44; and 80&#37; of the hemodialysis centers were included in the &#8804; 20&#37; interval&#46; We also pooled the 66 hemodialysis centers by frequency of HCV infection seroprevalence in three categories&#58; low HCV seroprevalence &#40;&#60; 5&#37;&#41;&#44; intermediate HCV seroprevalence &#40;5&#37;-15&#37;&#41;&#44; and high HCV seroprevalence &#40;&#62; 15&#37;&#41;&#46; We observed that 20&#37; of them were included in the low category&#44; 42&#37; in the intermediate&#44; and 37&#46;5&#37; in the high HCV seroprevalence category&#44; as proposed by Lombardi and coworkers in 1999&#46;<span class="elsevierStyleSup">23</span></p><p class="elsevierStylePara">The time on dialysis therapy &#40;in years&#41; was significantly correlated with the HCV infection seroprevalence &#40;p &#60; 0&#46;001&#41;&#44; as shown by the evaluation of a population of 884 patients in four hemodialysis centers &#40;table III&#41;&#46;</p><p class="elsevierStylePara">We did not find a statistically significant correlation &#40;r &#61; 0&#46;42&#59; p &#61; 0&#46;174&#41; between the average regional HDI and the mean monthly HCV infection seroprevalence in the municipalities of the same geographical region&#46; However&#44; in the regions were the HDI was the highest&#44; we observed a trend towards a higher HCV infection seroprevalence &#40;fig&#46; 2&#41;&#46;</p><p class="elsevierStylePara">HCV infection seroprevalence was investigated among 387 &#40;29&#37;&#41; health care professionals working at 14 hemodialysis centers &#40;19&#37;&#41; of the State of MG&#46; The mean number of health care workers was 27 &#40;7&#37;&#41; per hemodialysis center&#46; The health care workers were distributed by the time working with HD&#58; higher or lower than 10 years in groups G1 and G2&#44; respectively&#46; G1 comprised 159 health care workers &#40;41&#37;&#41; and G2 228 health care workers &#40;59&#37;&#41;&#46; In G1&#44; the anti-HCV serology was negative in all&#44; and in G2 three health care workers had anti-HCV seropositivity&#46; The mean working time at hemodialysis centers for the seropositive health care workers was 15&#46;6 years&#46; Of the seropositive health care workers&#44; one of them had an accident with contaminated material&#46; The HCV seroprevalence in all health care workers was 0&#46;8&#37;&#44; reaching 1&#46;3&#37; when we computed only those health care workers in G2&#46; There were no statistically significant differences when analyzing the HCV infection seroprevalence between G1 and G2&#44; taking into account the time of occupational exposure &#40;p &#61; 0&#46;27&#41;&#46; Among the health care workers of G2&#44; the anti-HCV seropositivity was not correlated with transfusions with blood derivatives&#44; tattoos&#44; parenteral drug abuse &#40;PDA&#41;&#44; or piercing &#40;table IV&#41;&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">DISCUSSION</span></p><p class="elsevierStylePara">Chronic hepatitis C produces a big impact on morbidity and mortality of patients with CRD on HD&#46;<span class="elsevierStyleSup">24&#44; 25</span> HD patients are particularly susceptible to HCV infection&#44; which may be attributed to nosocomial transmission and immune impairments characteristic of this specific group&#46;<span class="elsevierStyleSup">26&#44; 27</span> The prevalence studies are particularly useful to guide the decision-making process on diagnostic screening and to help during strategic planning of the preventive and therapeutic actions&#46; For these reasons&#44; the knowledge on the reality of HCV infection seroprevalence in hemodialysis centers in the State of MG was the main goal of this study and it will surely contribute to strict adoption of preventive and infection control measures&#44; as well as the reduction of the high seroprevalence of this disease&#46;</p><p class="elsevierStylePara">In order to carry out epidemiologic studies a representative sample is required&#46; In the State of MG there are 72 hemodialysis centers distributed in their 13 geographical regions&#44; and all of them were called to participate&#46; However&#44; hemodialysis patients from 66 hemodialysis centers comprised the population-based sample&#46; The exclusion of six centers did not compromise the results&#44; considering that most of them were included in the investigation&#44; which made possible to obtain a representative sample of the population of chronic renal patients on HD in the State of MG&#46; The data on hepatitis C seroprevalence were obtained from 7636 patients&#46; The high number of patients together with having including into the study hemodialysis centers from the whole State&#44; shows that the results found are representative of HCV infection seroprevalence in the hemodialysis centers of MG&#44; and from an epidemiological viewpoint they reflect the current situation of hepatitis C seroprevalence among HD patients of the State of MG&#44; southeast region of Brazil&#46;</p><p class="elsevierStylePara">The average hepatitis C seroprevalence found was 13&#37;&#46; The monthly and quarterly assessment of anti-HCV serology in the hemodialysis centers of MG for the year 2003 showed that there was no increase in the frequency of HCV seroprevalence&#46; These data are in agreement with the national scientific literature&#44; as has been reported by Rom&#227;o Junior and coworkers in 2004 for the entire country&#46;<span class="elsevierStyleSup">28</span> Similarly&#44; these data are similar to those described in other countries&#44; such as those by Geerlings and coworkers<span class="elsevierStyleSup">29 </span>and Jadoul and coworkers&#46;<span class="elsevierStyleSup">8</span> According to these authors&#44; the adoption of serologic assays in the cases of hepatitis C in blood manipulating centers and hemodialysis centers&#44; together with prevention and infection control measures at these centers led to a decrease in HCV infection seroprevalence among HD patients&#46;<span class="elsevierStyleSup">8&#44; 29</span></p><p class="elsevierStylePara">Apredominance of the male gender was observed in all age groups&#44; most of them aged 40-60 years&#44; the results being similar to previous descriptions&#46;<span class="elsevierStyleSup">28&#44; 30-32</span> It is known that age and gender do not correlate with a greater risk for HCV transmission&#59; <span class="elsevierStyleSup">10&#44; 11&#44; 25&#44; 33</span> However&#44; in HD patients this may be different considering that there is a preponderance of the male gender among end-stage CRD patients&#46;<span class="elsevierStyleSup">28&#44; 30-32</span></p><p class="elsevierStylePara">The main etiologies for CRD found were arterial hypertension &#40;30&#37;&#41;&#44; followed by chronic glomerulonephritis &#40;24&#37;&#41; and diabetes mellitus-associated nephropathy &#40;20&#37;&#41;&#46; These data are similar to previous descriptions for MG&#44;<span class="elsevierStyleSup">30&#44; 34 </span>Brazil&#44;<span class="elsevierStyleSup">28&#44; 32</span> the United States&#44;<span class="elsevierStyleSup">31</span> and other countries&#46;<span class="elsevierStyleSup">35</span> However&#44; this datum should be cautiously analyzed since the etiology of end-stage renal disease is unknown in a big proportion of CRD patients&#44; as has been observed in 10&#37; of the population starting on HD in MG in the year 1995&#46;<span class="elsevierStyleSup">30</span></p><p class="elsevierStylePara">Regional studies in Brazil<span class="elsevierStyleSup">32 </span>and in other Latin-American countries<span class="elsevierStyleSup">36</span> have placed and pointed out chronic glomerulonephritis as one of the main etiologies for CRD&#46; Among glomerulopathies&#44; it is known that focal and segmentary glomerulosclerosis &#40;FSGS&#41; and membranous-proliferative glomerulonephritis &#40;MPGN&#41; are among the ones most frequently leading to CRD&#46;<span class="elsevierStyleSup">32</span> MPGN has the peculiarity of being associated to infections with Schistosoma mansonii&#44; streptococci&#44; and hepatitis B and C viruses&#46;<span class="elsevierStyleSup">15&#44; 32</span> These characteristics contribute to the fact that MPGN is a common histological type in our setting&#44; by contrast to what has been observed in other countries&#46;<span class="elsevierStyleSup">32</span> Despite the fact that arterial hypertension and diabetes mellitus represent the leading causes of end-stage CRD&#44;<span class="elsevierStyleSup">31&#44; 35</span> we should take into account that the outbreaks of prevalent infectious diseases occurring in Brazil account for a big proportion of the cases progressing to end-stage CRD&#46;<span class="elsevierStyleSup">37&#44; 38</span> Anyhow&#44; in recent years the etiologic profile of CRD has changed both in Brazil and in other Latin-American countries&#46;<span class="elsevierStyleSup">36&#44; 38</span> The absence of histological confirmation&#44; the characteristic silent progression of the glomerular damage after the initial insult&#44; and the lack of an appropriate planning for the follow-up of patients at the pre-dialysis period are the main barriers precluding the knowledge on the true etiology of advanced chronic renal disease worldwide&#46;<span class="elsevierStyleSup">38</span></p><p class="elsevierStylePara">The number of patients maintained on HD in Brazil represents the fourth biggest casuistic worldwide&#44; only surpassed by those from the United Stated&#44; Japan&#44; and Germany&#46;<span class="elsevierStyleSup">28</span> Most of this population in Brazil concentrates in the southeastern region&#44; where the State of MG is located&#46; The mean HCV infection seroprevalence for the 66 hemodialysis centers studied was 13&#37; &#177; 9&#46;5&#37;&#44; with a variation of 0&#37;-50&#37;&#46; In just one hemodialysis center the HCV seroprevalence was 0&#37;&#46; This isolated and atypical event was attributed to the fact that this was a new center not contemplating the admission of anti-HCV positive patients &#40;&#171;old cases&#187;&#41;&#44; seropositive patients in transit&#44; patients during the &#171;immunological window&#187; due to the anti-HCV serological assay&#44; or contaminated patients not detected during the study&#46; A higher HCV seroprevalence also occurred in only one hemodialysis center and&#44; according to some reports&#44; several patients admitted for therapy came from other hemodialysis centers in the State of MG and other states due to budget-limiting issues of the Unique Health Care System &#40;UHCS&#41;&#46;</p><p class="elsevierStylePara">Another hemodialysis center started its activity in February of 2003 so that&#44; for the purpose of this study&#44; the monthly HCV seroprevalence from February to December of 2003 was considered&#46; It is interesting to observe that this is a newly created hemodialysis center with an initial seroprevalence of 2&#46;2&#37;&#44; and with an annual mean of 2&#46;6&#37;&#46; This fact may be attributed to admission of seropositive patients coming from other hemodialysis centers from the same region with a mean seroprevalence of 18&#46;5&#37;&#46;</p><p class="elsevierStylePara">By pooling the 66 hemodialysis centers into five frequency intervals of HCV seroprevalence it was observed that 80&#37; of them were included in the seroprevalence frequency interval of &#8804; 20&#37;&#44; and only two were in the 41&#37;-50&#37; interval&#46; In 1999&#44; Lombardi and coworkers&#44; in Italy&#44; used a similar way of pooling their data&#44; and they found rates and variations very similar to those found in our study&#46;<span class="elsevierStyleSup">23</span></p><p class="elsevierStylePara">Time on HD therapy is an important individual and independent risk factor for acquiring HCV infection&#44; the estimation being 10&#37; per year&#46;<span class="elsevierStyleSup">10&#44; 39</span> The multiple contamination opportunities to which the population of HD uremic patients are exposed are the main reason to explain this high sero-conversion index&#46; There is&#44; however&#44; a significant change in the risk factors for acquiring HCV infection currently&#46; Until 1992&#44; the highest risk factor for catching the virus infection in hemodialysis centers was blood transfusion together with the unavailability of erythropoietin for managing CRD-associated anemia&#46; Recently&#44; this picture began changing&#44; and nowadays the main HCV infection route in hemodialysis centers is nosocomial transmission&#46;<span class="elsevierStyleSup">10</span> About the HCV transmission according to time of exposure to HD&#44; we could infer a higher HCV seroprevalence among the oldest hemodialysis centers due to the higher risk for contamination&#46; In fact&#44; this study identified a number of HCV seropositive HD patients attending for more than a decade hemodialysis centers that have been working for more than 20 years&#46; It is likely that these patients may have got infected as a result of blood transfusions&#44; which were commonly performed at that time&#46; From an epidemiological perspective&#44; these are the so-called &#171;old cases&#187;&#44; which may have an impact when calculating the seroprevalence rates in this kind of studies&#46; On the other hand&#44; a lower HCV infection seroprevalence is expected in those hemodialysis centers that have been working between five and ten years&#46; However&#44; admission of old seropositive patients transferred from other hemodialysis centers to the newest ones may have contributed&#44; at least in part&#44; to alter the HCV seroprevalence rate in these newest centers&#46; It is important to highlight that an investigation on the incidence of HCV infection in hemodialysis centers was not among the objectives of our study&#46;</p><p class="elsevierStylePara">Most of the hemodialysis centers had an HCV seroprevalence &#60; 20&#37;&#44; and when the centers were categorized into low&#44; intermediate-&#44; and high-seroprevalence groups&#44; there was a predominance of the intermediate-seroprevalence group &#40;5-15&#37;&#41;&#46;</p><p class="elsevierStylePara">We also observed stability in HCV seroprevalence rates during the study period&#44; and there were no new hepatitis C cases recorded&#46; Similar results have been reported in Brazil <span class="elsevierStyleSup">28&#44;40</span> and other countries&#46;<span class="elsevierStyleSup">7&#44; 16&#44; 41-43</span></p><p class="elsevierStylePara">In Italy&#44; a positive correlation was reported between high seroprevalence and high incidence of HCV infection&#46;<span class="elsevierStyleSup">23</span> The authors found an HCV incidence rate of 0&#46;40&#37; in those hemodialysis centers with a seroprevalence up to 20&#37; and an incidence rate of 0&#46;94&#37;-1&#46;77&#37; in those centers with a seroprevalence of 40&#37;-50&#37;&#46; The reasons for these higher seroconversion indexes were blood transfusions &#40;13&#46;6&#37;&#41;&#44; violation of the universal precaution rules &#40;17&#37;&#41;&#44; and surgical procedures &#40;8&#46;5&#37;&#41;&#46; In 54&#46;2&#37; of the cases&#44; the causes could not be determined&#46; It is important to highlight that HCV transmission in HD centers may occur even in the absence of known risk factors&#46; Another study reported that there are approximately 10&#37;-50&#37; seropositive patients in whom no risk factors are identified&#46;<span class="elsevierStyleSup">10</span> This is one of the main arguments supporting nosocomial transmission of HCV&#44; associated to procedures such as frequent venous puncturing and sharing equipment in hemodialysis centers&#46; In addition&#44; we should not underestimate the possibility for HD patients of acquiring the infection in the community or due to other risk factors &#40;intravenous drug abuse&#41;&#46;<span class="elsevierStyleSup">10</span> Some authors suggest that the homogeneity of HCV genotypes in infected patients from a same HD service strengthens the hypothesis of nosocomial transmission&#46;<span class="elsevierStyleSup">10&#44; 15&#44; 44&#44; 45</span> However&#44; this hypothesis requires careful evaluation given the greater worldwide distribution of genotype 1&#44; and thus the greater chance of getting infected with the most prevalent genotype within a give region&#46; In Brazil&#44; the most common one is genotype <span class="elsevierStyleSup">1</span>&#44; followed by genotype 3&#46;<span class="elsevierStyleSup">46&#44; 47</span> Among other potential factors cited for nosocomial HCV transmission are re-use of capillaries&#44; contamination of HD machines surfaces&#44; as well as other equipment such as items shared by the patients during the HD procedures&#46;<span class="elsevierStyleSup">10&#44; 48&#44; 49</span></p><p class="elsevierStylePara">Although HCV seroprevalence rates among HD patients still are higher than in the general population&#44;<span class="elsevierStyleSup">50</span> the studies show a trend towards a decrease in hepatitis C prevalence and incidence rates in hemodialysis centers&#44; in recent years&#46;<span class="elsevierStyleSup">28&#44; 41&#44; 43&#44; 51</span> This was attributed to the adoption of effective preventive and nosocomial transmission control measures&#44; a decreased number in blood transfusions&#44; and the implementation of serological screening assays in blood-manipulating centers and hemodialysis centers&#46; Anti-HCV serological screening assays in blood-manipulating centers&#44; which are mandatory in Brazil since 1993&#44; represent the main reason explaining the significant decrease in horizontal transmission of HCV&#46; The implementation of these assays is mandatory in hemodialysis centers since 1996&#46;<span class="elsevierStyleSup">51&#44;52</span></p><p class="elsevierStylePara">The HDI is a general measurement of human development and it does not comprise all aspects related with development&#44;<span class="elsevierStyleSup">20</span> although it is a more complete and realistic index than the per capita gross domestic product&#44; which only considers the economical dimension of development&#46; According to the classification of the United Nations Development Program &#40;UNDP&#41;&#44;<span class="elsevierStyleSup">53</span> the State of MG lies among the regions of intermediate human development &#40;HDI&#58; 0&#46;5-0&#46;8&#41;&#46; In the State of MG&#44; hemodialysis centers are located at strategic municipalities and structured so as being able to obtain the resources necessary for implementing highcomplexity health care services&#46; The HDI in these municipalities is about 0&#46;7&#44; and the seroprevalence rates found were variable&#46; In other words&#44; there was no association between the HDI and the mean HCV seroprevalence in these municipalities &#40;r &#61; 0&#46;42&#59; p &#61; 0&#46;174&#41;&#44; although there was a trend towards a correlation&#46; An interesting observation is having found significant HCV seroprevalence rates in regions with high HDI&#46; The possible explanation for this might be the concentration of most of the old hemodialysis centers in those regions having the highest HDI&#44; and with a higher number of seropositive patients attributed to &#171;old cases&#187;&#46;</p><p class="elsevierStylePara">The risk for accidental contamination from needle sticking among health care workers is estimated to be 0&#37;-3&#37;&#44; reaching a maximum of 10&#37; in the case that the source of contamination has a positive viremia detected by means of molecular biology&#46;<span class="elsevierStyleSup">54-56</span> Another study estimates a risk of 0&#46;7&#37; among non-exposed health care workers<span class="elsevierStyleSup">57</span> and up to 2&#37; among exposed health care workers&#46;<span class="elsevierStyleSup">55</span> The anti-HCV seroprevalence was investigated in 387 &#40;29&#37;&#41; health care professionals working in 14 hemodialysis centers &#40;19&#37;&#41; of the State of MG&#46; The health care workers were divided into two groups &#191;G1 and G2&#191; based on the time of professional activity in HD being lower or higher than 10 years&#44; respectively&#46; The results show that&#44; on average&#44; each hemodialysis center has 27 health care workers&#46; One hundred and fifty-nine &#40;41&#37;&#41; were included in G1 and none of them was seropositive&#46; G2 comprised 228 health care workers &#40;59&#37;&#41; with three seropositive ones&#46; The average professional activity time for the three positive health care workers was 15&#46;6 years&#46; The risk factor in one case was an accident with contaminated material&#46; In the remaining two&#44; no risk factors were identified&#46; The HCV seroprevalence&#44; considering all health care workers in G1 and G2 was 0&#46;8&#37;&#44; and 1&#46;3&#37; for health care workers in G2&#46; The HCV seroprevalence among the health care professionals in this study&#44; although not being a risk measurement&#44; is similar to that described in other investigations&#46; En 1995&#44; the HCV seroprevalence observed among health care workers from 16&#37; of the hemodialysis centers of the United States was 2&#37;&#44; with variations from 0&#37; to 10&#37;&#46;41 In the year 2000&#44; Fabrizi and coworkers investigated the HCV seroprevalence among 20&#44;091 health care workers in the United States&#59; 349 &#40;1&#46;7&#37;&#41; tested positive&#46;<span class="elsevierStyleSup">17</span></p><p class="elsevierStylePara">We did not observe a significant difference in HCV seroprevalence in relation to the time of occupational exposure between workers in G1 and G2 &#40;p &#61; 0&#46;27&#41;&#46; So&#44; the duration of occupation in health care workers of the hemodialysis centers was not associated with an increase in HCV seroprevalence among them&#46; Assessing the risk for HCV transmission from the patients to the health care workers during their activity at the hemodialysis centers was not an objective in our study&#46;</p><p class="elsevierStylePara">To conclude&#44; this study shows that HCV seroprevalence among HD patients in MG is higher than that in the general population&#44; although lower than in previous years&#44; and similar to that described in European countries and in the United States of America&#59; the HCV seroprevalence varies among the hemodialysis centers from a same municipality and among hemodialysis centers from different regions of the State of MG&#59; the time on HD was associated with higher HCV seroprevalence&#59; we did not observe a quarterly increase in HCV seroprevalence in the hemodialysis centers during the study period&#59; there was no correlation between the regional HDI and HCV seroprevalence&#59; the trend towards a higher HCV seroprevalence at sites with higher HDI may be explained by the existence of older hemodialysis centers in these regions&#59; the anti-HCV seroprevalence among health care workers is similar to that described in other studies&#46;<br></br></p>"
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        "resumen" => "Los pacientes con enfermedad renal cr&#243;nica &#40;ERC&#41; en hemodi&#225;lisis &#40;HD&#41; constituyen un grupo expuesto al riesgo de adquirir una infecci&#243;n por el virus de la hepatitis C &#40;HCV&#41;&#46; Los objetivos de este estudio fueron la evaluaci&#243;n de la seroprevalencia de HCV en pacientes en HD en el Estado de Minas Gerais &#40;MG&#41;&#44; en el sudeste de Brasil&#44; y la correlaci&#243;n de esa seroprevalencia con el tiempo de tratamiento en HD y con el &#205;ndice de Desarrollo Humano &#40;IDH&#41; regional&#44; bien como la seroprevalencia del HCV en profesionales de la salud &#40;PS&#41; de HD&#46; Se evaluaron pacientes de 66 Centros de Hemodi&#225;lisis &#40;CH&#41; a trav&#233;s de un cuestionario validado en el que se consideraron los valores positivos para anti-HCV &#40;Elisa III&#41; en el a&#241;o de 2003&#46; La mayor&#237;a eran hombres &#40;56&#44;2&#37;&#41; entre 41-60 a&#241;os&#46; La seroprevalencia media de HCV fue de 13 &#177; 9&#44;5&#37;&#46; La seroprevalencia trimestral fue inferior a 20&#37;&#44; 15&#37; y 10&#37; en 75&#37;&#44; 50&#37; y 40&#37; de los CH&#44; respectivamente&#46; No hubo correlaci&#243;n entre el IDH y la seroprevalencia de HCV&#46; Hubo correlaci&#243;n positiva entre seroprevalencia de HCV y tiempo en HD en 884 pacientes de cuatro CH &#40;p &#60; 0&#44;001&#41;&#46; La seroprevalencia de HCV fue investigada en 387 PS divididos en dos grupos de acuerdo con el tiempo de actividad&#59; &#60; 10 a&#241;os &#40;G1&#41;&#44; &#62; 10 a&#241;os &#40;G2&#41;&#46; La seroprevalencia de HCV en los PS fue de 0&#44;8&#37;&#46; No hubo diferencia de seroprevalencia de HCV entre G1 y G2 con respecto al tiempo de exposici&#243;n ocupacional&#46; Se concluy&#243; que la seroprevalencia de HCV en pacientes en HD en MG fue del 13 &#177; 9&#44;5&#37; y &#60; 10&#37; en el 40&#37; de los CH evaluados&#44; no habiendo una correlaci&#243;n entre el IDH y la seroprevalencia del HCV&#46; En cambio&#44; hubo correlaci&#243;n positiva entre seroprevalencia del HCV y tiempo en HD&#44; siendo que la seroprevalencia HCV en los PS fue del 0&#44;8&#37;&#46;"
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        "resumen" => "Patients with chronic renal failure &#40;CRF&#41; in hemodialysis &#40;HD&#41; programs comprise a risk group for acquisition of hepatitis C virus &#40;HCV&#41; infection&#46; The objectives were to evaluate the seroprevalence of HCV in patients submitted to HD in State of Minas Gerais &#40;MG&#41;&#44; southest of Brazil&#59; to correlate this seroprevalence with the time of treatment on HD&#59; to investigate the anti-HCV seropositivity in health professionals&#44; to investigate the existence of a correlation between mean HCV seroprevalence and the human development index &#40;HDI&#41;&#46; Patients from 66 healthcare units &#40;HU&#41; were studied using a validated questionnaire and considering the positive values of anti-HCV &#40;Elisa III&#41; tests performed in these units between january and december 2003&#46; Results&#58; The majority of patients were male &#40;56&#46;2&#37;&#41;&#44; between 41 and 60 years old&#46; The mean seroprevalence of HCV in the 66 healthcare units was 13 &#177; 9&#46;5&#37;&#59; the threemonthly seroprevalence was below 20&#37;&#44; 15&#37; and 10&#37; in 75&#37;&#44; 50&#37; and 40&#37; of healthcare units&#44; respectively&#46; When the HU were grouped according to HCV seroprevalence into low &#40; &#60; 5&#37;&#41;&#44; medium &#40;5-15&#37;&#41; and high seroprevalence &#40;&#62; 15&#37;&#41;&#44; 20&#37; of the units have low&#44; 42&#37; medium and 37&#46;5&#37; were found to have high seroprevalence&#46; No correlation was found between HDI and HCV seroprevalence &#40;r &#61; 0&#46;42&#59; p &#61; 0&#46;174&#41; but in the regions in which the HDI was higher&#44; HCV seroprevalence was also higher&#46; There was a positive correlation between HCV seroprevalence and time on HD in 884 patients in the 4 HU &#40;p &#60; 0&#46;001&#41;&#46; The seroprevalence of HCV was investigated in 387 healthcare professionals &#40;29&#37;&#41; working in 14 HU&#46; They were divided into two groups according to their time of professional activity&#58; &#60; 10 y &#40;G1&#41; and &#62;10 y &#40;G2&#41;&#46; In G1&#44; there were no cases of anti-HCV seropositivity&#46; In G2&#44; 3 members of the staff were anti-HCV seropositive&#46; The mean time of work of the seropositive staff in the HU was 15&#46;6 years&#46; The seroprevalence of HCV was 0&#46;8&#37; when all the healthcare professionals were taken into consideration&#46; There was no statistically significant difference with respect to HCV seroprevalence between G1 and G2 with respect to the time of occupational exposure &#40;p &#61; 0&#46;27&#41;&#46; Conclusion&#58; The seroprevalence of HCV in patients on HD in MG is 13 &#177; 9&#46;5&#37; and was &#60; 10&#37; in 40&#37; of the HU&#59; there was no statistically significant correlation between HDI and seroprevalence of HCV in the healthcare units evaluated&#59; there was a statistically significant correlation between HCV seroprevalence and time of treatment on HD&#59; HCV seroprevalence in the health professionals studied was 0&#46;8&#37; and similar to the literature&#46;"
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The seroprevalence of HCV in Patients Submitted to Hemodialysis and Health Professionals in the State of Minas Gerais, Southwest of Brazil
Seroprevalencia del virus de la hepatitis C en pacientes en hemodiálisis y en profesionales de la salud en el Estado de Minas Gerais, región Sudeste de Brasil
J. M. M. Oliveira Penidoa, W. T.. Caiaffab, M.. Guimarães Penidoc, E. V. C. Caetanod, A. R.. Carvalhod, A. F.. Leited, S. C.. Fariad, I. V.. Gomided, A. A. B. Rosad, Maria Goretti Penidoe, R.. Teixeiraf
a Departamento de Ciências Médicas, Escuela de Farmacia de la Universidad Federal de Ouro Preto; Núcleo de Nefrología de Belo Horizonte, Brasil,
b Departamento de Medicina Preventiva y Social, Facultad de Medicina de la Universidad Federal de Minas Gerais, Brasil,
c Servicio de Nefrología, Santa Casa de Belo Horizonte, Minas Gerais, Brasil,
d Facultad de Medicina de la Universidad Federal de Minas Gerais, Minas Gerais, Brasil,
e Departamento de Pediatría, Facultad de Medicina de la Universidad Federal de Minas Gerais, Minas Gerais, Brasil,
f Departamento de Clínica Médica, Facultad de Medicina de la Universidad Federal de Minas Gerais, Minas Gerais, Brasil,
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    "textoCompleto" => "<p class="elsevierStylePara"><span class="elsevierStyleBold">INTRODUCTION AND OBJECTIVES</span></p><p class="elsevierStylePara">The World is facing a true epidemic of hepatitis C virus&#44; which represents a big public health challenge in this millennium&#46; Until 1998&#44; 170 million people carried the HCV worldwide&#44;<span class="elsevierStyleSup">1&#44; 2</span> and in recent years 200 million or 3&#37; of the world population is infected with this virus&#46;<span class="elsevierStyleSup">3&#44; 4</span> An estimation of the economic burden of chronic hepatitis C reveals an economic loss of about &#36;600 million&#46; It is calculated that between 2010 and 2019&#44; this disease will originate a loss of about 1&#46;83 millions of useful life&#44; with an estimated economic loss of &#36;54&#46;2 billions&#46;<span class="elsevierStyleSup">5</span></p><p class="elsevierStylePara">HCV infection is the main cause for chronic liver disease in HD patients&#46; Patients with stage V chronic renal disease &#40;CRD&#41; on HD represent a risk group susceptible of acquiring this infection&#46; The epidemiologic studies have shown that the incidence and seroprevalence of HCV infection in HD patients are declining in recent years&#46;<span class="elsevierStyleSup">6-8</span> However&#44; and despite the public health policies adopted in developed and developing countries&#44; the frequency of HCV seroprevalence in patients with stage V CRD on HD still is higher than in the general population&#46;<span class="elsevierStyleSup">7&#44; 9-12</span> In these patients&#44; the main risk factors for acquiring the virus are frequent exposure to blood derivatives&#44; <span class="elsevierStyleSup">13</span> contaminated medical equipments&#44; the number of years on dialysis therapy&#44;<span class="elsevierStyleSup">13&#44; 14</span> and the lack of adherence to the universal infection prevention and control measures&#46;<span class="elsevierStyleSup">10&#44; 15</span></p><p class="elsevierStylePara">HCV seroprevalence in health care workers is three fold higher than that in workers in other industries&#46; Thus&#44; health care workers in dialysis centers are a special risk group for acquiring the virus&#46;<span class="elsevierStyleSup">16&#44; 17</span></p><p class="elsevierStylePara">The Brazilian population-based studies on HCV seroprevalence still are scant&#46; An HCV seroprevalence of 1&#46;42&#37; was shown in 1059 healthy individuals<span class="elsevierStyleSup">18</span> and of 1&#46;7&#37; in 119 healthy individuals from an indigenous population&#46;<span class="elsevierStyleSup">19</span> In MG&#44; there are no consistent data so far on HCV seroprevalence in the general population&#46;</p><p class="elsevierStylePara">The goals of this study were&#58; to evaluate the frequency of HCV seroprevalence in patients with stage V CRD on HD program in the hemodialysis centers of the State of MG in Southeast Brazil&#59; to correlate this seroprevalence with the time on HD therapy&#59; to investigate the HCV seroprevalence in health care workers of these hemodialysis centers&#59; and to verify whether there exists a correlation between the average HCV seroprevalence of dialysis centers and HDI from the&#160; different regions of the State of MG&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">PARTICIPANTS AND METHODS</span></p><p class="elsevierStylePara">Study design&#58; This is a multicenter cross-sectional epidemiological study carried out in the period January to December of 2003 among the hemodialysis centers of the State of MG in the Southeast region of Brazil&#44; where the health care status in relation to HCV infection was investigated among individuals with stage V CRD on HD program and among health care workers&#46;</p><p class="elsevierStylePara">Subjects&#46; Inclusion criteria&#58; hemodialysis centers giving their consent to participate in the study on HCV seroprevalence with serological control by means of the anti-HCV ELISA III assay in HD patients and health care workers&#44; by filling-up a validated questionnaire&#46; After their consent&#44; 66 &#40;92&#37;&#41; hemodialysis centers out of a total of 72 were included into the study&#46; Of the six centers excluded&#44; one did not answer the questionnaire and five had not available the full monthly data on&#160; anti- HCV serology of the HD patients&#46; Also included into the study were those hemodialysis centers starting their services in the year 2003 provided that they had solid data corresponding to the subsequent months during the study period&#46; In these cases&#44; the information taken into account was that from the time they started their services&#46;</p><p class="elsevierStylePara">Methods&#58;We applied a previously designed&#44; tested&#44; and validated questionnaire exclusively of the purpose of this study&#46; The Health Secretary&#191;s Office of the State of MG &#40;HSOSMG&#41; offered its database for an eventual consultation&#46; The HDI values were obtained from the Human Development Atlas&#46;<span class="elsevierStyleSup">20</span> The monthly HCV seroprevalence of the municipalities and geographical regions of the State of MG was calculated by dividing the number of patients with positive anti-HCV serology by the total number of patients submitted to HD per month at the hemodialysis centers&#46; In order to calculate the frequency of HCV seroprevalence among health care workers we used the same methodology&#46;</p><p class="elsevierStylePara">Measurements&#58; The primary outcome variable was the serology of anti-HCV ELISA III antibodies performed monthly in CRD patients on HD at the hemodialysis centers included&#46; The secondary outcomes variables were the demographical data of the patients&#58; age&#44; gender&#44; etiology of renal disease&#44; time on HD&#44; serology of anti-HCV ELISA III antibodies among health care workers&#44; frequency of HCV seroprevalence in the hemodialysis centers of the municipalities of one region and mean regional HDI&#46;</p><p class="elsevierStylePara">Statistical analysis&#58; The information gathered in the questionnaires was digitalized in a database developed with Microsoft Access version 2000 software&#46; We established the mean annual HCV seroprevalence as the response variable&#46; The descriptive data were obtained from the frequency of the characteristics of the different variables&#46; In order to compare the mean regional HDI and the monthly average of the frequency of regional HCV seroprevalence&#44; and continuous variables we used the Pearson&#191;s correlation coefficient &#40;r&#41;&#46; This coefficient provides the level of the strength of the linear relationship between two continuous variables&#44; and varies from&#191;1 to &#43;1&#44; including the naught value&#46; The r<span class="elsevierStyleSup">2</span> value is the proportion of the mean standard variation and that explained by x &#40;or vice versa&#41;&#46; The level of statistical significance was established at 0&#46;05 with a statistical power of 80&#37;&#46;<span class="elsevierStyleSup">21</span></p><p class="elsevierStylePara">Ethical issues&#58; The investigation project was approved by the Ethical and Investigation Committee of the Federal University of Minas Gerais &#40;UFMG&#41;&#44; complying with the 196&#47;96 Resolution of the National Health Council&#44; which establishes the rules for investigations on human beings&#46;<span class="elsevierStyleSup">22</span> Besides&#44; we sent explanatory letters on the investigation project to the HSOSMG&#44; the Brazilian Society of Nephrology &#40;SBN&#41;&#44; the National Association of Kidney Donors and Transplanted Patients &#40;Associa&#231;&#227;o Nacional dos Doadores e Transplantados Renais &#40;DORETRANS&#41;&#44; and to the hemodialysis centers of the State of MG&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">RESULTS</span></p><p class="elsevierStylePara">Descriptive study&#58; By December of 2003&#44; 7636 patients with stage V CRD were on a HD program in the 66 hemodialysis centers of the State of MG&#44; Southeast Brazil&#46; Of them&#44; 4&#44;290 &#40;56&#46;2&#37;&#41; were males and 3346 &#40;43&#46;8&#37;&#41; were females&#46; About their age&#44; 265 &#40;3&#46;5&#37;&#41; patients had 0-20 years&#44; 647 &#40;8&#46;5&#37;&#41; 21-30 years&#44; 1&#44;154 &#40;15&#46;0&#37;&#41; 31-40 years&#44; 1&#44;819 &#40;23&#46;8&#37;&#41; 41-50 years&#44; 1&#44;654 &#40;21&#46;7&#37;&#41; 51-60 years&#44; 1259 &#40;16&#46;5&#37;&#41; 61-70 years&#44; and 838 &#40;11&#46;0&#37;&#41; more than 70 years&#46; There was a preponderance of the male gender in all age groups &#40;table I&#41;&#46;</p><p class="elsevierStylePara">The most common etiologies of CRD were arterial hypertension &#40;30&#37;&#41;&#44; chronic glomerulonephritis &#40;24&#37;&#41;&#44; and diabetic nephropathy &#40;20&#37;&#41;&#46; The sample loss was 10&#37;&#46; The mean number of patients in the six centers excluded &#40;83 &#177; 29&#41; was similar to the mean number of patients in the centers included &#40;101 &#177; 59&#41;&#46; There were no statistically significant differences &#40;p &#61; 0&#46;46&#41;&#46; The number of hemodialysis centers by each region of the State of MG and the quarterly seroprevalence results of HCV infection are shown in table II&#46;</p><p class="elsevierStylePara">The mean quarterly seroprevalence of HCV infection in the State of MG was 13 &#177; 9&#37;&#46; The lowest HCV seroprevalence was found in the region of Vale do Jequitinhonha and the highest in the southeastern region of the State&#46; The quarterly seroprevalence of HCV infection in the 66 hemodialysis centers of MG was lower than 20&#37;&#44; 15&#37;&#44; and 10&#37; in 75&#37;&#44; 50&#37;&#44; and 40&#37; of the hemodialysis centers&#44; respectively&#44; as shown in figure 1&#46;</p><p class="elsevierStylePara">The 66 hemodialysis centers were pooled in five frequency intervals of HCV infection seroprevalence&#44; considering the average HCV infection seroprevalence &#40;&#8804; 10&#37;&#44; 11&#37;-20&#37;&#44; 21&#37;-30&#37;&#44; 31&#37;-40&#37;&#44; and 41&#37;-50&#37;&#41;&#46; Only two hemodialysis centers were included within the interval 41&#37;-50&#37;&#44; being one in the Southeast region and the other one in the region of Tri&#226;ngulo do Norte&#46; No hemodialysis centers were included in the interval 31&#37;-40&#37;&#44; and 80&#37; of the hemodialysis centers were included in the &#8804; 20&#37; interval&#46; We also pooled the 66 hemodialysis centers by frequency of HCV infection seroprevalence in three categories&#58; low HCV seroprevalence &#40;&#60; 5&#37;&#41;&#44; intermediate HCV seroprevalence &#40;5&#37;-15&#37;&#41;&#44; and high HCV seroprevalence &#40;&#62; 15&#37;&#41;&#46; We observed that 20&#37; of them were included in the low category&#44; 42&#37; in the intermediate&#44; and 37&#46;5&#37; in the high HCV seroprevalence category&#44; as proposed by Lombardi and coworkers in 1999&#46;<span class="elsevierStyleSup">23</span></p><p class="elsevierStylePara">The time on dialysis therapy &#40;in years&#41; was significantly correlated with the HCV infection seroprevalence &#40;p &#60; 0&#46;001&#41;&#44; as shown by the evaluation of a population of 884 patients in four hemodialysis centers &#40;table III&#41;&#46;</p><p class="elsevierStylePara">We did not find a statistically significant correlation &#40;r &#61; 0&#46;42&#59; p &#61; 0&#46;174&#41; between the average regional HDI and the mean monthly HCV infection seroprevalence in the municipalities of the same geographical region&#46; However&#44; in the regions were the HDI was the highest&#44; we observed a trend towards a higher HCV infection seroprevalence &#40;fig&#46; 2&#41;&#46;</p><p class="elsevierStylePara">HCV infection seroprevalence was investigated among 387 &#40;29&#37;&#41; health care professionals working at 14 hemodialysis centers &#40;19&#37;&#41; of the State of MG&#46; The mean number of health care workers was 27 &#40;7&#37;&#41; per hemodialysis center&#46; The health care workers were distributed by the time working with HD&#58; higher or lower than 10 years in groups G1 and G2&#44; respectively&#46; G1 comprised 159 health care workers &#40;41&#37;&#41; and G2 228 health care workers &#40;59&#37;&#41;&#46; In G1&#44; the anti-HCV serology was negative in all&#44; and in G2 three health care workers had anti-HCV seropositivity&#46; The mean working time at hemodialysis centers for the seropositive health care workers was 15&#46;6 years&#46; Of the seropositive health care workers&#44; one of them had an accident with contaminated material&#46; The HCV seroprevalence in all health care workers was 0&#46;8&#37;&#44; reaching 1&#46;3&#37; when we computed only those health care workers in G2&#46; There were no statistically significant differences when analyzing the HCV infection seroprevalence between G1 and G2&#44; taking into account the time of occupational exposure &#40;p &#61; 0&#46;27&#41;&#46; Among the health care workers of G2&#44; the anti-HCV seropositivity was not correlated with transfusions with blood derivatives&#44; tattoos&#44; parenteral drug abuse &#40;PDA&#41;&#44; or piercing &#40;table IV&#41;&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">DISCUSSION</span></p><p class="elsevierStylePara">Chronic hepatitis C produces a big impact on morbidity and mortality of patients with CRD on HD&#46;<span class="elsevierStyleSup">24&#44; 25</span> HD patients are particularly susceptible to HCV infection&#44; which may be attributed to nosocomial transmission and immune impairments characteristic of this specific group&#46;<span class="elsevierStyleSup">26&#44; 27</span> The prevalence studies are particularly useful to guide the decision-making process on diagnostic screening and to help during strategic planning of the preventive and therapeutic actions&#46; For these reasons&#44; the knowledge on the reality of HCV infection seroprevalence in hemodialysis centers in the State of MG was the main goal of this study and it will surely contribute to strict adoption of preventive and infection control measures&#44; as well as the reduction of the high seroprevalence of this disease&#46;</p><p class="elsevierStylePara">In order to carry out epidemiologic studies a representative sample is required&#46; In the State of MG there are 72 hemodialysis centers distributed in their 13 geographical regions&#44; and all of them were called to participate&#46; However&#44; hemodialysis patients from 66 hemodialysis centers comprised the population-based sample&#46; The exclusion of six centers did not compromise the results&#44; considering that most of them were included in the investigation&#44; which made possible to obtain a representative sample of the population of chronic renal patients on HD in the State of MG&#46; The data on hepatitis C seroprevalence were obtained from 7636 patients&#46; The high number of patients together with having including into the study hemodialysis centers from the whole State&#44; shows that the results found are representative of HCV infection seroprevalence in the hemodialysis centers of MG&#44; and from an epidemiological viewpoint they reflect the current situation of hepatitis C seroprevalence among HD patients of the State of MG&#44; southeast region of Brazil&#46;</p><p class="elsevierStylePara">The average hepatitis C seroprevalence found was 13&#37;&#46; The monthly and quarterly assessment of anti-HCV serology in the hemodialysis centers of MG for the year 2003 showed that there was no increase in the frequency of HCV seroprevalence&#46; These data are in agreement with the national scientific literature&#44; as has been reported by Rom&#227;o Junior and coworkers in 2004 for the entire country&#46;<span class="elsevierStyleSup">28</span> Similarly&#44; these data are similar to those described in other countries&#44; such as those by Geerlings and coworkers<span class="elsevierStyleSup">29 </span>and Jadoul and coworkers&#46;<span class="elsevierStyleSup">8</span> According to these authors&#44; the adoption of serologic assays in the cases of hepatitis C in blood manipulating centers and hemodialysis centers&#44; together with prevention and infection control measures at these centers led to a decrease in HCV infection seroprevalence among HD patients&#46;<span class="elsevierStyleSup">8&#44; 29</span></p><p class="elsevierStylePara">Apredominance of the male gender was observed in all age groups&#44; most of them aged 40-60 years&#44; the results being similar to previous descriptions&#46;<span class="elsevierStyleSup">28&#44; 30-32</span> It is known that age and gender do not correlate with a greater risk for HCV transmission&#59; <span class="elsevierStyleSup">10&#44; 11&#44; 25&#44; 33</span> However&#44; in HD patients this may be different considering that there is a preponderance of the male gender among end-stage CRD patients&#46;<span class="elsevierStyleSup">28&#44; 30-32</span></p><p class="elsevierStylePara">The main etiologies for CRD found were arterial hypertension &#40;30&#37;&#41;&#44; followed by chronic glomerulonephritis &#40;24&#37;&#41; and diabetes mellitus-associated nephropathy &#40;20&#37;&#41;&#46; These data are similar to previous descriptions for MG&#44;<span class="elsevierStyleSup">30&#44; 34 </span>Brazil&#44;<span class="elsevierStyleSup">28&#44; 32</span> the United States&#44;<span class="elsevierStyleSup">31</span> and other countries&#46;<span class="elsevierStyleSup">35</span> However&#44; this datum should be cautiously analyzed since the etiology of end-stage renal disease is unknown in a big proportion of CRD patients&#44; as has been observed in 10&#37; of the population starting on HD in MG in the year 1995&#46;<span class="elsevierStyleSup">30</span></p><p class="elsevierStylePara">Regional studies in Brazil<span class="elsevierStyleSup">32 </span>and in other Latin-American countries<span class="elsevierStyleSup">36</span> have placed and pointed out chronic glomerulonephritis as one of the main etiologies for CRD&#46; Among glomerulopathies&#44; it is known that focal and segmentary glomerulosclerosis &#40;FSGS&#41; and membranous-proliferative glomerulonephritis &#40;MPGN&#41; are among the ones most frequently leading to CRD&#46;<span class="elsevierStyleSup">32</span> MPGN has the peculiarity of being associated to infections with Schistosoma mansonii&#44; streptococci&#44; and hepatitis B and C viruses&#46;<span class="elsevierStyleSup">15&#44; 32</span> These characteristics contribute to the fact that MPGN is a common histological type in our setting&#44; by contrast to what has been observed in other countries&#46;<span class="elsevierStyleSup">32</span> Despite the fact that arterial hypertension and diabetes mellitus represent the leading causes of end-stage CRD&#44;<span class="elsevierStyleSup">31&#44; 35</span> we should take into account that the outbreaks of prevalent infectious diseases occurring in Brazil account for a big proportion of the cases progressing to end-stage CRD&#46;<span class="elsevierStyleSup">37&#44; 38</span> Anyhow&#44; in recent years the etiologic profile of CRD has changed both in Brazil and in other Latin-American countries&#46;<span class="elsevierStyleSup">36&#44; 38</span> The absence of histological confirmation&#44; the characteristic silent progression of the glomerular damage after the initial insult&#44; and the lack of an appropriate planning for the follow-up of patients at the pre-dialysis period are the main barriers precluding the knowledge on the true etiology of advanced chronic renal disease worldwide&#46;<span class="elsevierStyleSup">38</span></p><p class="elsevierStylePara">The number of patients maintained on HD in Brazil represents the fourth biggest casuistic worldwide&#44; only surpassed by those from the United Stated&#44; Japan&#44; and Germany&#46;<span class="elsevierStyleSup">28</span> Most of this population in Brazil concentrates in the southeastern region&#44; where the State of MG is located&#46; The mean HCV infection seroprevalence for the 66 hemodialysis centers studied was 13&#37; &#177; 9&#46;5&#37;&#44; with a variation of 0&#37;-50&#37;&#46; In just one hemodialysis center the HCV seroprevalence was 0&#37;&#46; This isolated and atypical event was attributed to the fact that this was a new center not contemplating the admission of anti-HCV positive patients &#40;&#171;old cases&#187;&#41;&#44; seropositive patients in transit&#44; patients during the &#171;immunological window&#187; due to the anti-HCV serological assay&#44; or contaminated patients not detected during the study&#46; A higher HCV seroprevalence also occurred in only one hemodialysis center and&#44; according to some reports&#44; several patients admitted for therapy came from other hemodialysis centers in the State of MG and other states due to budget-limiting issues of the Unique Health Care System &#40;UHCS&#41;&#46;</p><p class="elsevierStylePara">Another hemodialysis center started its activity in February of 2003 so that&#44; for the purpose of this study&#44; the monthly HCV seroprevalence from February to December of 2003 was considered&#46; It is interesting to observe that this is a newly created hemodialysis center with an initial seroprevalence of 2&#46;2&#37;&#44; and with an annual mean of 2&#46;6&#37;&#46; This fact may be attributed to admission of seropositive patients coming from other hemodialysis centers from the same region with a mean seroprevalence of 18&#46;5&#37;&#46;</p><p class="elsevierStylePara">By pooling the 66 hemodialysis centers into five frequency intervals of HCV seroprevalence it was observed that 80&#37; of them were included in the seroprevalence frequency interval of &#8804; 20&#37;&#44; and only two were in the 41&#37;-50&#37; interval&#46; In 1999&#44; Lombardi and coworkers&#44; in Italy&#44; used a similar way of pooling their data&#44; and they found rates and variations very similar to those found in our study&#46;<span class="elsevierStyleSup">23</span></p><p class="elsevierStylePara">Time on HD therapy is an important individual and independent risk factor for acquiring HCV infection&#44; the estimation being 10&#37; per year&#46;<span class="elsevierStyleSup">10&#44; 39</span> The multiple contamination opportunities to which the population of HD uremic patients are exposed are the main reason to explain this high sero-conversion index&#46; There is&#44; however&#44; a significant change in the risk factors for acquiring HCV infection currently&#46; Until 1992&#44; the highest risk factor for catching the virus infection in hemodialysis centers was blood transfusion together with the unavailability of erythropoietin for managing CRD-associated anemia&#46; Recently&#44; this picture began changing&#44; and nowadays the main HCV infection route in hemodialysis centers is nosocomial transmission&#46;<span class="elsevierStyleSup">10</span> About the HCV transmission according to time of exposure to HD&#44; we could infer a higher HCV seroprevalence among the oldest hemodialysis centers due to the higher risk for contamination&#46; In fact&#44; this study identified a number of HCV seropositive HD patients attending for more than a decade hemodialysis centers that have been working for more than 20 years&#46; It is likely that these patients may have got infected as a result of blood transfusions&#44; which were commonly performed at that time&#46; From an epidemiological perspective&#44; these are the so-called &#171;old cases&#187;&#44; which may have an impact when calculating the seroprevalence rates in this kind of studies&#46; On the other hand&#44; a lower HCV infection seroprevalence is expected in those hemodialysis centers that have been working between five and ten years&#46; However&#44; admission of old seropositive patients transferred from other hemodialysis centers to the newest ones may have contributed&#44; at least in part&#44; to alter the HCV seroprevalence rate in these newest centers&#46; It is important to highlight that an investigation on the incidence of HCV infection in hemodialysis centers was not among the objectives of our study&#46;</p><p class="elsevierStylePara">Most of the hemodialysis centers had an HCV seroprevalence &#60; 20&#37;&#44; and when the centers were categorized into low&#44; intermediate-&#44; and high-seroprevalence groups&#44; there was a predominance of the intermediate-seroprevalence group &#40;5-15&#37;&#41;&#46;</p><p class="elsevierStylePara">We also observed stability in HCV seroprevalence rates during the study period&#44; and there were no new hepatitis C cases recorded&#46; Similar results have been reported in Brazil <span class="elsevierStyleSup">28&#44;40</span> and other countries&#46;<span class="elsevierStyleSup">7&#44; 16&#44; 41-43</span></p><p class="elsevierStylePara">In Italy&#44; a positive correlation was reported between high seroprevalence and high incidence of HCV infection&#46;<span class="elsevierStyleSup">23</span> The authors found an HCV incidence rate of 0&#46;40&#37; in those hemodialysis centers with a seroprevalence up to 20&#37; and an incidence rate of 0&#46;94&#37;-1&#46;77&#37; in those centers with a seroprevalence of 40&#37;-50&#37;&#46; The reasons for these higher seroconversion indexes were blood transfusions &#40;13&#46;6&#37;&#41;&#44; violation of the universal precaution rules &#40;17&#37;&#41;&#44; and surgical procedures &#40;8&#46;5&#37;&#41;&#46; In 54&#46;2&#37; of the cases&#44; the causes could not be determined&#46; It is important to highlight that HCV transmission in HD centers may occur even in the absence of known risk factors&#46; Another study reported that there are approximately 10&#37;-50&#37; seropositive patients in whom no risk factors are identified&#46;<span class="elsevierStyleSup">10</span> This is one of the main arguments supporting nosocomial transmission of HCV&#44; associated to procedures such as frequent venous puncturing and sharing equipment in hemodialysis centers&#46; In addition&#44; we should not underestimate the possibility for HD patients of acquiring the infection in the community or due to other risk factors &#40;intravenous drug abuse&#41;&#46;<span class="elsevierStyleSup">10</span> Some authors suggest that the homogeneity of HCV genotypes in infected patients from a same HD service strengthens the hypothesis of nosocomial transmission&#46;<span class="elsevierStyleSup">10&#44; 15&#44; 44&#44; 45</span> However&#44; this hypothesis requires careful evaluation given the greater worldwide distribution of genotype 1&#44; and thus the greater chance of getting infected with the most prevalent genotype within a give region&#46; In Brazil&#44; the most common one is genotype <span class="elsevierStyleSup">1</span>&#44; followed by genotype 3&#46;<span class="elsevierStyleSup">46&#44; 47</span> Among other potential factors cited for nosocomial HCV transmission are re-use of capillaries&#44; contamination of HD machines surfaces&#44; as well as other equipment such as items shared by the patients during the HD procedures&#46;<span class="elsevierStyleSup">10&#44; 48&#44; 49</span></p><p class="elsevierStylePara">Although HCV seroprevalence rates among HD patients still are higher than in the general population&#44;<span class="elsevierStyleSup">50</span> the studies show a trend towards a decrease in hepatitis C prevalence and incidence rates in hemodialysis centers&#44; in recent years&#46;<span class="elsevierStyleSup">28&#44; 41&#44; 43&#44; 51</span> This was attributed to the adoption of effective preventive and nosocomial transmission control measures&#44; a decreased number in blood transfusions&#44; and the implementation of serological screening assays in blood-manipulating centers and hemodialysis centers&#46; Anti-HCV serological screening assays in blood-manipulating centers&#44; which are mandatory in Brazil since 1993&#44; represent the main reason explaining the significant decrease in horizontal transmission of HCV&#46; The implementation of these assays is mandatory in hemodialysis centers since 1996&#46;<span class="elsevierStyleSup">51&#44;52</span></p><p class="elsevierStylePara">The HDI is a general measurement of human development and it does not comprise all aspects related with development&#44;<span class="elsevierStyleSup">20</span> although it is a more complete and realistic index than the per capita gross domestic product&#44; which only considers the economical dimension of development&#46; According to the classification of the United Nations Development Program &#40;UNDP&#41;&#44;<span class="elsevierStyleSup">53</span> the State of MG lies among the regions of intermediate human development &#40;HDI&#58; 0&#46;5-0&#46;8&#41;&#46; In the State of MG&#44; hemodialysis centers are located at strategic municipalities and structured so as being able to obtain the resources necessary for implementing highcomplexity health care services&#46; The HDI in these municipalities is about 0&#46;7&#44; and the seroprevalence rates found were variable&#46; In other words&#44; there was no association between the HDI and the mean HCV seroprevalence in these municipalities &#40;r &#61; 0&#46;42&#59; p &#61; 0&#46;174&#41;&#44; although there was a trend towards a correlation&#46; An interesting observation is having found significant HCV seroprevalence rates in regions with high HDI&#46; The possible explanation for this might be the concentration of most of the old hemodialysis centers in those regions having the highest HDI&#44; and with a higher number of seropositive patients attributed to &#171;old cases&#187;&#46;</p><p class="elsevierStylePara">The risk for accidental contamination from needle sticking among health care workers is estimated to be 0&#37;-3&#37;&#44; reaching a maximum of 10&#37; in the case that the source of contamination has a positive viremia detected by means of molecular biology&#46;<span class="elsevierStyleSup">54-56</span> Another study estimates a risk of 0&#46;7&#37; among non-exposed health care workers<span class="elsevierStyleSup">57</span> and up to 2&#37; among exposed health care workers&#46;<span class="elsevierStyleSup">55</span> The anti-HCV seroprevalence was investigated in 387 &#40;29&#37;&#41; health care professionals working in 14 hemodialysis centers &#40;19&#37;&#41; of the State of MG&#46; The health care workers were divided into two groups &#191;G1 and G2&#191; based on the time of professional activity in HD being lower or higher than 10 years&#44; respectively&#46; The results show that&#44; on average&#44; each hemodialysis center has 27 health care workers&#46; One hundred and fifty-nine &#40;41&#37;&#41; were included in G1 and none of them was seropositive&#46; G2 comprised 228 health care workers &#40;59&#37;&#41; with three seropositive ones&#46; The average professional activity time for the three positive health care workers was 15&#46;6 years&#46; The risk factor in one case was an accident with contaminated material&#46; In the remaining two&#44; no risk factors were identified&#46; The HCV seroprevalence&#44; considering all health care workers in G1 and G2 was 0&#46;8&#37;&#44; and 1&#46;3&#37; for health care workers in G2&#46; The HCV seroprevalence among the health care professionals in this study&#44; although not being a risk measurement&#44; is similar to that described in other investigations&#46; En 1995&#44; the HCV seroprevalence observed among health care workers from 16&#37; of the hemodialysis centers of the United States was 2&#37;&#44; with variations from 0&#37; to 10&#37;&#46;41 In the year 2000&#44; Fabrizi and coworkers investigated the HCV seroprevalence among 20&#44;091 health care workers in the United States&#59; 349 &#40;1&#46;7&#37;&#41; tested positive&#46;<span class="elsevierStyleSup">17</span></p><p class="elsevierStylePara">We did not observe a significant difference in HCV seroprevalence in relation to the time of occupational exposure between workers in G1 and G2 &#40;p &#61; 0&#46;27&#41;&#46; So&#44; the duration of occupation in health care workers of the hemodialysis centers was not associated with an increase in HCV seroprevalence among them&#46; Assessing the risk for HCV transmission from the patients to the health care workers during their activity at the hemodialysis centers was not an objective in our study&#46;</p><p class="elsevierStylePara">To conclude&#44; this study shows that HCV seroprevalence among HD patients in MG is higher than that in the general population&#44; although lower than in previous years&#44; and similar to that described in European countries and in the United States of America&#59; the HCV seroprevalence varies among the hemodialysis centers from a same municipality and among hemodialysis centers from different regions of the State of MG&#59; the time on HD was associated with higher HCV seroprevalence&#59; we did not observe a quarterly increase in HCV seroprevalence in the hemodialysis centers during the study period&#59; there was no correlation between the regional HDI and HCV seroprevalence&#59; the trend towards a higher HCV seroprevalence at sites with higher HDI may be explained by the existence of older hemodialysis centers in these regions&#59; the anti-HCV seroprevalence among health care workers is similar to that described in other studies&#46;<br></br></p>"
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        "resumen" => "Los pacientes con enfermedad renal cr&#243;nica &#40;ERC&#41; en hemodi&#225;lisis &#40;HD&#41; constituyen un grupo expuesto al riesgo de adquirir una infecci&#243;n por el virus de la hepatitis C &#40;HCV&#41;&#46; Los objetivos de este estudio fueron la evaluaci&#243;n de la seroprevalencia de HCV en pacientes en HD en el Estado de Minas Gerais &#40;MG&#41;&#44; en el sudeste de Brasil&#44; y la correlaci&#243;n de esa seroprevalencia con el tiempo de tratamiento en HD y con el &#205;ndice de Desarrollo Humano &#40;IDH&#41; regional&#44; bien como la seroprevalencia del HCV en profesionales de la salud &#40;PS&#41; de HD&#46; Se evaluaron pacientes de 66 Centros de Hemodi&#225;lisis &#40;CH&#41; a trav&#233;s de un cuestionario validado en el que se consideraron los valores positivos para anti-HCV &#40;Elisa III&#41; en el a&#241;o de 2003&#46; La mayor&#237;a eran hombres &#40;56&#44;2&#37;&#41; entre 41-60 a&#241;os&#46; La seroprevalencia media de HCV fue de 13 &#177; 9&#44;5&#37;&#46; La seroprevalencia trimestral fue inferior a 20&#37;&#44; 15&#37; y 10&#37; en 75&#37;&#44; 50&#37; y 40&#37; de los CH&#44; respectivamente&#46; No hubo correlaci&#243;n entre el IDH y la seroprevalencia de HCV&#46; Hubo correlaci&#243;n positiva entre seroprevalencia de HCV y tiempo en HD en 884 pacientes de cuatro CH &#40;p &#60; 0&#44;001&#41;&#46; La seroprevalencia de HCV fue investigada en 387 PS divididos en dos grupos de acuerdo con el tiempo de actividad&#59; &#60; 10 a&#241;os &#40;G1&#41;&#44; &#62; 10 a&#241;os &#40;G2&#41;&#46; La seroprevalencia de HCV en los PS fue de 0&#44;8&#37;&#46; No hubo diferencia de seroprevalencia de HCV entre G1 y G2 con respecto al tiempo de exposici&#243;n ocupacional&#46; Se concluy&#243; que la seroprevalencia de HCV en pacientes en HD en MG fue del 13 &#177; 9&#44;5&#37; y &#60; 10&#37; en el 40&#37; de los CH evaluados&#44; no habiendo una correlaci&#243;n entre el IDH y la seroprevalencia del HCV&#46; En cambio&#44; hubo correlaci&#243;n positiva entre seroprevalencia del HCV y tiempo en HD&#44; siendo que la seroprevalencia HCV en los PS fue del 0&#44;8&#37;&#46;"
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        "resumen" => "Patients with chronic renal failure &#40;CRF&#41; in hemodialysis &#40;HD&#41; programs comprise a risk group for acquisition of hepatitis C virus &#40;HCV&#41; infection&#46; The objectives were to evaluate the seroprevalence of HCV in patients submitted to HD in State of Minas Gerais &#40;MG&#41;&#44; southest of Brazil&#59; to correlate this seroprevalence with the time of treatment on HD&#59; to investigate the anti-HCV seropositivity in health professionals&#44; to investigate the existence of a correlation between mean HCV seroprevalence and the human development index &#40;HDI&#41;&#46; Patients from 66 healthcare units &#40;HU&#41; were studied using a validated questionnaire and considering the positive values of anti-HCV &#40;Elisa III&#41; tests performed in these units between january and december 2003&#46; Results&#58; The majority of patients were male &#40;56&#46;2&#37;&#41;&#44; between 41 and 60 years old&#46; The mean seroprevalence of HCV in the 66 healthcare units was 13 &#177; 9&#46;5&#37;&#59; the threemonthly seroprevalence was below 20&#37;&#44; 15&#37; and 10&#37; in 75&#37;&#44; 50&#37; and 40&#37; of healthcare units&#44; respectively&#46; When the HU were grouped according to HCV seroprevalence into low &#40; &#60; 5&#37;&#41;&#44; medium &#40;5-15&#37;&#41; and high seroprevalence &#40;&#62; 15&#37;&#41;&#44; 20&#37; of the units have low&#44; 42&#37; medium and 37&#46;5&#37; were found to have high seroprevalence&#46; No correlation was found between HDI and HCV seroprevalence &#40;r &#61; 0&#46;42&#59; p &#61; 0&#46;174&#41; but in the regions in which the HDI was higher&#44; HCV seroprevalence was also higher&#46; There was a positive correlation between HCV seroprevalence and time on HD in 884 patients in the 4 HU &#40;p &#60; 0&#46;001&#41;&#46; The seroprevalence of HCV was investigated in 387 healthcare professionals &#40;29&#37;&#41; working in 14 HU&#46; They were divided into two groups according to their time of professional activity&#58; &#60; 10 y &#40;G1&#41; and &#62;10 y &#40;G2&#41;&#46; In G1&#44; there were no cases of anti-HCV seropositivity&#46; In G2&#44; 3 members of the staff were anti-HCV seropositive&#46; The mean time of work of the seropositive staff in the HU was 15&#46;6 years&#46; The seroprevalence of HCV was 0&#46;8&#37; when all the healthcare professionals were taken into consideration&#46; There was no statistically significant difference with respect to HCV seroprevalence between G1 and G2 with respect to the time of occupational exposure &#40;p &#61; 0&#46;27&#41;&#46; Conclusion&#58; The seroprevalence of HCV in patients on HD in MG is 13 &#177; 9&#46;5&#37; and was &#60; 10&#37; in 40&#37; of the HU&#59; there was no statistically significant correlation between HDI and seroprevalence of HCV in the healthcare units evaluated&#59; there was a statistically significant correlation between HCV seroprevalence and time of treatment on HD&#59; HCV seroprevalence in the health professionals studied was 0&#46;8&#37; and similar to the literature&#46;"
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¿Es usted profesional sanitario apto para prescribir o dispensar medicamentos?

Are you a health professional able to prescribe or dispense drugs?