HIV vaccine trial shut down

Federal researchers shut down a clinical trial of an HIV vaccine involving about 2,500 subjects after it is found to be ineffective at preventing healthy subjects from contracting the virus. In another major setback for efforts to develop an HIV vaccine, federal researchers have shut down a key clinical trial after an independent panel of safety experts determined that volunteers who got an experimental vaccine appeared to be slightly more likely to contract the human immunodeficiency virus than those who got a placebo.

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