Warren K S, Heeney J L, Swan R A, Verschoor E J
Division of Veterinary and Biomedical Sciences, Murdoch University, Western Australia, Australia.
J Virol. 1999 Sep;73(9):7860-5. doi: 10.1128/JVI.73.9.7860-7865.1999.
A high prevalence (42.6%) of hepatitis B virus (HBV) infection was suspected in 195 formerly captive orangutans due to a large number of serum samples which cross-reacted with human HBV antigens. It was assumed that such viral infections were contracted from humans during captivity. However, two wild orangutans were identified which were HBV surface antigen positive, indicating that HBV or related viruses may be occurring naturally in the orangutan populations. Sequence analyses of seven isolates revealed that orangutans were infected with hepadnaviruses but that these were clearly divergent from the six known human HBV genotypes and those of other nonhuman hepadnaviruses reported. Phylogenetic analyses revealed geographic clustering with Southeast Asian genotype C viruses and gibbon ape HBV. This implies a common origin of infection within this geographic region, with cross-species transmission of hepadnaviruses among hominoids.
由于大量血清样本与人类乙肝病毒(HBV)抗原发生交叉反应,在195只曾被圈养的红毛猩猩中怀疑有较高比例(42.6%)感染了乙肝病毒。据推测,此类病毒感染是在圈养期间从人类身上感染的。然而,鉴定出两只野生红毛猩猩乙肝病毒表面抗原呈阳性,这表明乙肝病毒或相关病毒可能在红毛猩猩种群中自然存在。对七个分离株的序列分析显示,红毛猩猩感染了嗜肝DNA病毒,但这些病毒明显不同于已知的六种人类乙肝病毒基因型以及所报道的其他非人类嗜肝DNA病毒的基因型。系统发育分析显示,与东南亚C基因型病毒和长臂猿乙肝病毒存在地理聚类。这意味着在该地理区域内存在共同的感染源,嗜肝DNA病毒在类人猿之间发生了跨物种传播。