Harvard Medical School Guides

A Harvard Medical School Guide: Cold and Flu

Ah-choo! You're bound to hear that sound along with sniffling, coughing, and nose-blowing every winter when cold-and-flu season sprinkles its misery on just about everyone. Up to 20% of Americans get the flu every year, and Americans suffer one billion colds. Children get colds and the flu more often than adults. Some kids get as many as 12 colds a year, while adults average two to four. …

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