The origins of HIV can be traced back millions rather than tens of thousands of years, research suggests.
A genetic study shows HIV-like viruses arose in African monkeys and apes 5 million to 12 million years ago.
The research may one day lead to a better understanding of HIV and Aids.
HIV affects 34 million people worldwide.
The disease emerged during the 20th century after a HIV-like virus jumped from chimps to humans.
See on bbc.co.uk
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