A world first: Vaccine helps prevent HIV infection By MARILYNN MARCHIONE and MICHAEL CASEY, Associated Press Writers Thu Sep 24, 3:27 am ET 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. Article Here:A world first: Vaccine helps prevent HIV infection - Yahoo! News For those who follow, this is a very encouraging (borderline exciting) report. Ciao- T.D.