25 January 2013
Updated at 02:53 ET
HIV 'may have an ancient origin'
Helen Briggs
BBC News
Bonobo chimps in Africa
Related Stories
Synthetic farm virus built in lab
'HIV life expectancy rises' in UK
The origins of HIV can be traced back millions rather than tens of thousands of years, research suggests.
link-
http://www.bbc.co.uk/news/science-environment-21189141