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Mystery of HIV Vaccine Failure Deepens Tuesday, July 21, 2009 - Ehud Rattner Home >> Headlines >> Medicine   
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Two groups of scientists have cast doubt on a leading explanation for the failure of a key HIV vaccine. The two teams examined immune cells from volunteers who received the vaccine used in the STEP trial. The vaccine was built on a backbone made from a modified cold virus — adenovirus 5. In the STEP trial, people who had been infected with adenovirus 5 before receiving the experimental vaccine were more likely to become infected with HIV than people who had not. (source: nature.com)
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