Prevalence of hepatitis C virus infection in Nanjing, southern China.

There is little information on the prevalence of hepatitis C virus (HCV) infection in China. The prevalence of HCV infection was determined in 998 subjects (398 with liver disease and 600 without) in the city of Nanjing in southern China. Subjects were tested for anti-HCV antibodies by a second generation assay. We also determined serological HCV genotypes and HCV RNA sequences. Among the 600 subjects without liver disease, 3 (0.5%) were seroreactive for anti-HCV. All were less than 12 years of age and had a history of transfusion. Of the 398 liver disease patients, 20 (5.0%) were seroreactive for anti-HCV. Of 16 patients in whom serological HCV genotype was determined, 10 (62.5%) were infected with HCV type 1, 5 (31.3%) with type 2 and 1 (6.3%) undetermined. HCV genomes sequenced from 2 patients belonged to genotype 2 and were closely related to strains in Beijing and Japan by molecular evolutionary analysis. These results suggest that HCV infection is rare and not a major cause of liver disease in southern China.