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HIV-1 vs HIV-2

RYBICKI, ED ED at molbiol.uct.ac.za
Wed Mar 15 04:32:16 EST 1995

> From:          "Patrick O'Neil" <patrick at corona>
> Subject:       Re: HIV-1 vs HIV-2
> On 15 Mar 1995, Gary Ross wrote:
> > Hi.  I am a biologist but have been working out of field for   
> > about seven years.  Can someone give me a brief(?) rundown on   
> > HIV-1 vs HIV-2 viruses?
> > 
> HIV in general appears to have jumped into humans from Gabonese 
mandrills> from 1 to 2 centuries ago.  From this jump, the two HIV 
strains diverged,
> The most parsimonious scenario of all has an HIV ancestor 
incubating > within human populations for about a thousand years or 
so, with jumps > into various simian lines within the last few 

Whaaaaaaaat?  Says who?!  All of a sudden, HIV has been in HUMANS 
for a thousand odd years, and gets BACK into simians??

Surely a most parsimonious explanation is that HIVs separated in 
simians, and went merrily along until humans were infected in recent 
times?  Far mor eparsimonious than postualting all of the jumps into 
monkeys that would have been necessary to acccount for all of the 
SIVs, several of which are quite divergent.  And some of which, I 
might point out, don't cause immunodeficiency disease in their 
natural hosts - indicating a better adaptation to these than to 
other hosts, such as lab monkeys.
 | Ed Rybicki, PhD          |  (ed at molbiol.uct.ac.za)  |
 | Dept Microbiology        | University of Cape Town  |    
 | Private Bag, Rondebosch  |   7700, South Africa     |          
 | fax: xx27-21-650 4023    |  tel: xx27-21-650 3265   |  
 |       URL: http://www.uct.ac.za/microbiology        |

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