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Why is measles so contagious?

Lesson created by Lauren McAlpine using TED-Ed's lesson creatorVideo from SciShow YouTube channel

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You might be surprised to hear that measles is 10 times more contagious than Ebola or the plague. So what makes the measles virus so contagious? And how do epidemiologists quantify a disease's catchiness? SciShow explores why measles is so dangerous.

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