Posts Tagged ‘virus’

Science: The human immunodeficiency virus (HIV-1) responsible for most of the AIDS cases in the world infected people approximately 100 years ago, more than 20 years earlier than previously believed, according to findings presented here this week at the Evolution 2008 meeting. Its lesser known cousin, HIV-2, jumped into humans decades later, from a monkey species that carried the virus for just a couple of hundred years, not the millions of years researchers had assumed, according to other research presented at the meeting.

Researchers are trying to pin down the origins of both HIVs to understand how often new human viruses emerge. Both arose from simian immunodeficiency viruses (SIVs) of other primates.