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Inside Each Flu Shot, Months Of Virus Tracking

Every year, the flu almost goes extinct in temperate places like the United States. The key word is "almost." It stays afloat by constantly moving. "It looks like it's hopping between different cities and different populations," says Sarah Cobey, a computational biologist at the University of Chicago. http://www.npr.org/sections/health-shots/2015/11/27/457403589/inside-each-flu-shot-months-of-virus-tracking-and-predictions #FullNewsAudioAvailable #NPR

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