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Cold and Flu Center

Colds

The cold is the most commonly occurring illness in the entire world, with more than 1 billion colds per year reported in the United States alone. The common cold is a self-limiting illness caused by any 1 of more than 200 viruses. The common cold produces mild symptoms usually lasting only 5-10 days. In contrast, the "flu" (influenza), which is caused by a different class of virus, can have severe symptoms.

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