Why some people are more contagious than others

December 17, 2014 1:24 PM

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Why some people are more contagious than others

When it comes to spreading viral and bacterial infections, some people are more contagious than others—much more contagious.

Known as superspreaders, they amount to roughly 20 percent of the population, but they account for transmission of about 80% of certain infectious diseases, scientists estimate. The phenomenon has been observed, among other contagions, during the global SARS outbreak in 2002 and 2003 and as far back...

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