AP photo
Nurse Susan Peel gives a whooping cough vaccination to a student at Inderkum High School Monday, in Sacramento, Calif. 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.
Read the article: Study: Whooping cough vaccination fades in 3 years
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