FOXNews.com: Whooping cough vaccine loses punch too fast

FOXNews.com FOX News Network - We Report. You Decide.

Whooping cough vaccine loses punch too fast Sep 13th 2012, 11:46 As the U.S. wrestles with its biggest whooping cough outbreak in decades, researchers appear to have zeroed in on the main cause: The safer vaccine that was introduced in the 1990s loses effectiveness much faster than previously thought

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