A genetic study of SIV - the Aids-like virus that infects
monkeys - suggests that HIV - the virus that causes Aids in
humans - came about through the combination of two viruses
in chimpanzees.

We know more about the origin of Aids than most people think.
Genetic studies have shown conclusively that HIV is a variant of
the Simian Immunodeficiency Virus (SIV) that is found in wild
African monkeys and apes.

By Dr David Whitehouse 
BBC News Online science editor 

http://news.bbc.co.uk/1/hi/sci/tech/2983092.stm

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