Whooping cough outbreaks traced to change in vaccine

April 24, 2015 12:10 PM

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Whooping cough outbreaks traced to change in vaccine

The recent outbreaks of whooping cough in the United States may be due, in part, to a change made two decades ago to vaccine ingredients, a new study finds.

In 2012, the United States had about 48,000 cases of whooping cough (also called pertussis) — the most cases since 1955. Although the numbers dropped in 2013 and 2014 to about 29,000 cases yearly, there are still far more cases now than in decades past. Between 1965 and 2002, there were no more than...

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