A 3-year follow-up of HCV-RNA viraemia in haemodialysis patients

Background. Hepatitis C virus (HCV) infection in a population of haemodialysed patients was studied over a 3-year follow-up period in order to evaluate the changes in viral RNA, diversity of genotypes, and serological response to synthetic HCV peptides. Methods. Twenty-eight (32.9%) patients with anti-HCV antibodies from a total of 85 patients assigned to a haemodialysis unit were studied. The serological response to immunopeptides was evaluated by immunoblotting, viral RNA in serum was detected using the polymerase chain reaction (RT-PCR), and genotyping was carried out by hybridization with probes fixed to nitrocellulose paper. Results. Of the 28 haemodialysis patients who had anti-HCV antibodies, three (10.7%) were always RNA negative, six (21.4%) were always RNA positive, and 19 (67.8%) were variable RNA. There was an incomplete antibody response to non structural antigens in non-viraemic patients. Genotype was determined in 23 patients, and the other two could not be genotyped. The most common genotype was Ib (69.4%), followed by la (17.4%), and 2a, 3a, and 4a (each 4.4%). Conclusions. Haemodialysis patients, when followed up for a long time, frequently show an intermittent HCV viraemia state, suggesting that HCV cannot be evaluated adequately by isolated RNA determinations.