HIV virus 'appears to be evolving' - Prof David Dausey

A new study suggests HIV is becoming less infectious and deadly as it evolves.

Scientists at the University of Oxford studied hundreds of women carrying the virus in Botswana and found that it was having to undergo damaging mutations to survive.

Prof David Dausey is Dean of Public Health at Mercyhurst University in Pennsylvania. He told the BBC's Newsday that the study was significant, but he also urged caution, saying that it was a "slow evolution" that would take a long period of time.