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Vials of Tdap vaccine sit on a table at a Solano County, Calif., health fair in August 2010.
Justin Sullivan/Getty Images
May 5, 2015 Effectiveness of the vaccine within one year of the final booster was 73 percent. But it fell to 34 percent in two to four years, an analysis of a Washington state epidemic found.
False-color transmission electron micrograph of a field of whooping cough bacteria, Bordetella pertussis.
A. Barry Dowsett/Science Source
April 25, 2014 Scientists tracking the ancestry of whooping cough say it arose abruptly in humans about 500 years ago, caused by a mutated bacterium that once lived only in animals. Genetic tricks helped it spread.
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