A discovery changes the date of the first HIV infection

though it was first isolated in the 1980s, it is generally accepted that the aids virus was rampant in the 1950s. A theory supports this premise: the disease spread when an experimental polio vaccine, cultured in primate cells, was tested on the people in Africa. There are other theories to explain the virus crossing over to humans. An evolutionary biologist has now claimed proof that the virus has been with us for more than a century