Hepatitis C Prevalence and Risk Factors in Hemodialysis Patients in Central Brazil: a Survey by Polymerase Chain Reaction and Serological Methods

Mem Inst Oswaldo Cruz 2001, Volume 96, Number 6, pp. 765-769 Hepatitis C Prevalence and Risk Factors in Hemodialysis Patients in Central Brazil: a Survey by Polymerase Chain Reaction and Serological Methods Megmar AS Carneiro, Regina MB Martins, Sheila A Teles, Simonne A Silva, Carmen L Lopes, Divina DP Cardoso, Bart OM Vanderborght, Clara FT Yoshida Code Number: oc01121 ABSTRACT: An hemodialysis population in Central Brazil was screened by polymerase chain reaction (PCR) and serological methods to assess the prevalence of hepatitis C virus (HCV) infection and to investigate associated risk factors. All hemodialysis patients (n=428) were interviewed in eight dialysis units in Goiânia city. Blood samples were collected and serum samples screened for anti-HCV antibodies by an enzyme-linked immunosorbent assay (ELISA). Positive samples were retested for confirmation with a line immunoassay (LIA). All samples were also tested for HCV RNA by the PCR. An overall prevalence of 46.7% (CI 95%: 42-51.5) was found, ranging from 20.7% (CI 95%: 8.8-38.1) to 90.4% (CI 95%: 79.9-96.4) depending on the dialysis unit. Of the 428 patients, 185 were found to be seropositive by ELISA, and 167 were confirmed positive by LIA, resulting in an anti-HCV prevalence of 39%. A total of 131 patients were HCV RNA-positive. HCV viremia was present in 63.5% of the anti-HCV-positive patients and in 10.3% of the anti-HCV-negative patients. Univariate analysis of risk factors showed that the number of previous blood transfusions, transfusion of blood before mandatory screening for anti-HCV, length of time on hemodialysis, and treatment in multiple units were associated with HCV positivity. However, multivariate analysis revealed that blood transfusion before screening for anti-HCV and length of time on hemodialysis were significantly associated with HCV infection in this population. These data suggest that nosocomial transmission may play a role in the spread of HCV in the dialysis units studied. In addition to anti-HCV screening, HCV RNA detection is necessary for the diagnosis of HCV infection in hemodialysis patients. KEYWORDS: hepatitis C, hemodialysis, prevalence, risk factors, Central Brazil Copyright 2001 Mem Inst Oswaldo Cru