In this photo taken Saturday, Sept. 26, 2009, AIDS volunteers Kajit Klinkachorn, 33, left, Saichon Booncharoen, 3rd left, Aree Gumpolrat, 32, right, and together with an NGO co-ordinator Pitchayapan Sripa, 33, 2nd left, share experience about being AIDS volunteers at Nong Tapan village in Rayong province southeastern Thailand. 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. The vaccine cut the risk of becoming infected with HIV by more than 31 percent in the world's largest AIDS vaccine trial of more than 16,000 volunteers in Thailand, researchers announced Thursday, Sept. 22, 2009. (AP Photo/Apichart Weerawong) (Post in khmernz.blogspot.com)
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