1 can ask if ths HIV comes frm SIV-generally it is accpted tht HIV - TopicsExpress

1 can ask if ths HIV comes frm SIV-generally it is accpted tht HIV is a descendant of a SIV bcoscertain strains of SIVs bear a vry close resemblance 2 HIV-1 n HIV-2 wch r 2 types of HIV,HIV-2 corresponds 2 SIVsm,a strain of the Simian Immunodeficiency Virus found in the sooty mangabey(knwn s White-collared monkey)whch is indigenous 2 Western Africa.The more virulent,pandemic strain of HIV,i.e HIV-1 wsuntil recently more difficult 2 place.Until 1999,the closest counterpart tht hd bn identified ws SIVcpz,the SIV ound in chimpanzees,ths virus hweva stil hd certain significant differences frm HIV*blv it or nt nthn bt th truth*

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