How Measles Detectives Work To Contain An Outbreak

Health Leaders: On any given day, more than 4,000 people pass through the library at California State University-Los Angeles.

On April 11, one of them had measles. The building has only one entrance, which means that anyone who entered or exited the library within two hours of that person's visit potentially was exposed to one of the most contagious diseases on Earth.

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