Published September 20, 2011, 12:03 AM
Whooping cough vaccination fades in 3 years, study says
The whooping cough vaccine given to babies and toddlers loses much of its effectiveness after just three years — a lot faster than doctors believed — and that could help explain a recent series of outbreaks in the U.S. among children who were fully vaccinated, a study suggests.By: Mike Stobbe, Associated Press
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