http://en.wikipedia.org/wiki/Subtypes_of_HIV
HIV-2[edit source | editbeta]

HIV-2 has not been widely seen outside of Africa. The first case in the United States was in 1987.[15] Many test kits for HIV-1 will also detect HIV-2.[16]
As of 2010, there are 8 known HIV-2 groups (A to H). Of these, only groups A and B are epidemic. Group A spread mainly in West Africa, but also to Angola, Mozambique, Brazil, India, and very limitedly to Europe or the US. Group B is mainly confined to West Africa.[17][18]
HIV-2 is mostly related to simian immunodeficiency virus endemic in sooty mangabeys (Cercocebus atys atys) (SIVsmm), a monkey species inhabiting the forests of littoral West Africa. Phylogenetic analyses show that the viruses most closely related to the two strains of HIV-2 which spread considerably in humans (HIV-2 groups A and B) are the SIVsmm found in the sooty mangabeys of the Tai forest, in western Ivory Coast.[17]
There are six additional known HIV-2 groups, each having been found in just one person. They all seem to derive from independent transmissions from sooty mangabeys to humans. Groups C and D have been found in two people fromLiberia, groups E and F have been discovered in two people from Sierra Leone, and groups G and H have been detected in two people from the Ivory Coast. Each of these HIV-2 strains, for which humans are probably dead-end hosts, is most closely related to SIVsmm strains from sooty mangabeys living in the same country where the human infection was found.[17][18]


-- MÌnh tóm tắt lại là: HIV-2 chỉ có ở châu Phi và dường như rất hiếm gặp chủng này ở các vùng khác. TUy nhiên nhiều phương cách xét nghiệm HIV-1 cũng có thể phát hiện ra HIV-2. Hy vọng tài liệu trên đã giải đáp phần nào cho bạn



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