From a just released UN report
The Outlook report says young people in 16 of the world's 25 worst-affected countries with HIV are becoming sexually active later and having fewer sexual partners.
In countries such as Botswana, Ethiopia, Kenya, Malawi and Zimbabwe the reduction in new HIV infections, measured among young pregnant women presenting for antenatal check-ups, indicates that these nations will achieve UN targets for reducing HIV rates among the young this year.
Case study: Kenya
* 60% decline in HIV prevalence between 2000 and 2005 * Urban areas: HIV prevalence dropped from 14.2% to 5.4% * Rural areas: HIV prevalence dropped from from 9.2% to 3.6%