Spanish 16-year-old becomes country’s first minor to undergo sex change operation

Spanish teen undergoes sex change operation

Thailand mandates waiting period, cross-dressing to make sex change surgery more difficult

Thailand looks to limit sex change surgery

Full results from first successful test of AIDS vaccine show it modestly prevents infection

Full results show AIDS vaccine is of modest help

Fresh results from the world’s first successful test of an experimental AIDS vaccine confirm that it is only marginally effective.

Big hearts, concern about disease credited with making Thai AIDS vaccine trials successful

Volunteers key to success of Thai vaccine trials

NONGTAPAN, Thailand — Nearly 16,000 Thais ignored the false rumors that they were being infected by the AIDS virus, and overcame their fears of becoming social outcasts to participate in the first HIV vaccine trials to show positive results.

A world first: AIDS vaccine cuts the risk of HIV infection by 31 percent in big Thai study

A world first: Vaccine helps prevent HIV infection

BANGKOK — For the first time, an experimental vaccine has prevented infection with the AIDS virus, a watershed event in the deadly epidemic and a surprising result. Recent failures led many scientists to think such a vaccine might never be possible.