Experimental AIDS Vaccine Fails Crucial Experiment
AP:
A promising experimental vaccine to prevent the AIDS virus has failed in a crucial experiment, with volunteers becoming infected with HIV anyway, leading the drug developer to halt the study.
Merck & Co. said Friday that it is ending enrollment and vaccination of volunteers in the large international study, which is partly funded by the National Institutes of Health.
It was a significant setback in the daunting quest to develop a vaccine to prevent AIDS. Merck's vaccine was the farthest along and was closely watched by experts in the field.



First Posted: 03/28/08 03:45 AM ET Updated: 05/25/11 01:15 PM ET