Scientists continued to unravel clues as to why a combination of two preventive HIV vaccines—ALVAC HIV and AIDSVAX B/E—may have worked for some but not others in a large scale clinical trial reported in 2009. A new paper published online ahead of print in The New England Journal of Medicine (NEJM) suggests those who produced relatively high levels of a specific antibody after receiving the vaccinations in study RV 144 were less likely to become infected with HIV, compared with those who did not.
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