AIDS: Down, but not out | The Economist:
"the number of such infections there has fallen from 2.6m in 1998 (the peak) to 1.8m in 2011. Reasons for this include changes in people’s sexual behaviour, such as reduced promiscuity and more frequent use of condoms; the spread of antiretroviral drugs which, in addition to saving the lives of those infected, also stop them passing the virus on; reductions in mother-to-child transmission; and a new fashion for circumcision amongst Africa’s men. Having the snip has been shown to be a particularly effective way of cutting transmission rates."
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