Social cycle aids HIV spread

By analysing the similarity of viral genetic sequences from nearly 1,600 people with HIV in one community in KwaZulu-Natal, the study shows that adolescent girls and women in their early 20s tend to pick up the virus from men aged around 30. When the women grow older, they go on to infect their long-term partners, who in turn may pass the virus on through affairs with younger women.

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