Objective: To examine the prevalence and the sequence of the genes of new genotypes of hepatitis G virus (HGV) in Guangxi, China.
Methods: Serum samples were collected from 85 intravenous drug abusers (IVDAs), 80 patients with liver diseases (PLDs) and 50 blood donors (BDs). All sera (n=215) were tested by using EIA for HBsAg, anti-HCV and anti-HIV, and by using nested PCR for HGV RNA. In 62 subjects positive for HGV, HGV RNA was sequenced, and a phylogenetic tree was constructed for analyzing genotypes of HGV.
Results: HGV RNA was detected in 85 of 215 serum samples (39.53%). The positivity rates for HBsAg, anti-HCV and anti-HIV were 39.07%, 42.79% and 0, respectively. First, 11 nucleotide sequences were determined and the isolates were grouped into three clusters with HGV. 5 of 11 HGV isolates clustered in a distinct phylogenetic branch (genotype Asia) which was different from the described GBV-C and HGV sequences, suggesting the presence of a new genotype of HGV in this locality. Second, 51 nucleotide sequences were determined and analyzed for their genotypes of HGV, and showed genotype GBV-C (3.23%), genotype HGV 30-65% and new genotype (genotype Asia) 64.51%, respectively.
Conclusions: There were subgenotypes in 3 genotypes of HGV; The predominant genotypes of HGV were genotype Asia and genotype HGV among IVDAs, PLDs, and BDs patients in Guangxi, China.
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