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article imageOlder TB vaccines 'work better'

By kml     Mar 18, 2007 in Health
French scientists says old vaccines are better at preventing cases of tuberculosis than more commonly used modern vaccines.
Modern BCG vaccine strains are used in two-thirds of immunisations worldwide. The National Academy of Sciences report says newer vaccines are less effective than old vaccines.
The researchers at the Institut Pasteur say clinical trials should be done to retest the older strains
French scientists has developed the BCG vaccine in 1908 who managed to make a strain of tuberculosis (TB) less potent by growing it in a glycerin-potato mixture
Once they found it was safe, they began to distribute the vaccine around the world.
At that time, the only way to keep the vaccine strain alive in the laboratory was to continue to grow it in the culture.
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