So what exactly is whoopingcough? And why are cases suddenly on the rise? Here's what to know: Get top local stories in SanDiego delivered to you every morning. Sign up for NBC SanDiego ...
There have been 18,506 cases of whoopingcough reported so far, the Centers for Disease Control and Prevention said. That’s the most at this point in the year since 2014, when cases topped 21,800.
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