“…Some of the differences are explained by the individual prevalence of HIV and HBV in the different populations studied. Although there are reports from central and south America [17][18][19][20][21][22] , the majority of the studies are from regions of Africa, India and the Far East, regions where the prevalence of both HIV and HBV is high [23][24][25][26][27] . Differences also arise from the type of high-risk group to which the co-infection patients studied belong (e.g., hemodialysis patients, homosexuals, intravenous drug users).…”