| prevalence of hbv infection among different hiv-risk groups in hai phong, vietnam. | hepatitis b virus (hbv) infection in hai phong, northern vietnam, was characterized by analyzing the prevalence and genotype distribution of hbv as well as co-infection with human immunodeficiency virus type 1 (hiv-1) among five different risk groups for hiv infection. plasma samples were collected from intravenous drug users (n=760, anti-hiv-1 antibody positive rate: 35.9%), female sex workers (fsws; n=91, 23.1%), seafarers (n=94, 0%), pregnant women (n=200, 0.5%), and blood donors (n=210, 2.9% ... | 2011 | 21264859 |