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Explained in plain English

What is a measles outbreak?

A measles outbreak happens when there's a sudden increase in cases of the disease in a specific area, like the hundreds of cases seen in Pennsylvania. It's particularly concerning because measles is highly contagious. The current situation is America's worst since the 1990s, showing the seriousness of the spread.

Stories that explain this

Fourth person dies in Pennsylvania measles outbreak that infected hundreds

Related explainers

Why are measles cases rising? What is acute encephalomyelitis? Who is most at risk? Who investigates health outbreaks? What are measles symptoms? How do outbreaks affect farmers? Where are outbreaks common? How are outbreaks controlled?

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