U.S. Army and Thai researchers announced to great fanfare last month that a combination vaccine had produced a statistically significant 31 percent reduction in new HIV infections in a trial of more than 18,000 people in Thailand — a modest rate, but it is the first vaccine whose results that suggested it eventually might be possible to produce a vaccine against the deadly infection, which has killed more than 25 million people.
ANALYSIS: Researchers Question AIDS Vaccine Results
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