The following is an excerpt.
HIV, which causes AIDs, emerged in humans in the 20th Century, but scientists have long known that similar viruses in monkeys and apes have existed for much longer.
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.
Read the full article here: HIV ‘may have an ancient origin’