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WASHINGTON (Reuters) - More than 3,000 people who volunteered to receive an experimental Merck and Co. AIDS vaccine are being told to come back and get extra tests because the jab may itself raise the risk of infection.
"Specifically, 24 cases of HIV infection were seen among the 741 volunteers who received at least one dose of the investigational vaccine, while 21 cases of HIV infection were seen in the 762 participants who received at least one dose of the placebo," the National Institute of Allergy and Infectious Diseases, which was co-sponsoring the trial with Merck, said in a statement.
The second trial had begun in South Africa earlier this year, and had enrolled 800 volunteers