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News/Event Item
TB Vaccine Losing Its Power, Study Finds
March 14, 2007
By Joseph Hall
The bacteria used for almost nine decades to make all the world's tuberculosis vaccines may have evolved to the point where it is almost useless in combating the disease, according to a new study involving Montreal's McGill University.
An international effort to map and analyze the genome of bacillus Calmette-Guerin (BCG) has shown the organism, the key ingredient in all TB vaccines, has mutated significantly since it was first used in 1921. The study is to be published this week in Proceedings of the National Academy of Sciences Online.
The BCG vaccine is administered more than 2 million infants a week around the world in countries where tuberculosis is endemic.
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category: News from Other Sources : General Health News
contributed by Liza Nanni on 14 March 2007
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