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Why is measles so contagious?

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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.

If you’re in close contact with someone who has measles and you’re unvaccinated, your changes of getting sick are about:

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