Colds and the Flu | Causes & Risk Factors

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What causes colds and the flu?

Viruses cause colds and the flu. More than 200 different viruses can cause colds. Not as many viruses cause the flu. That's why there's a shot available for the flu and not for colds.

Bibliography

See a list of resources used in the development of this information.

Written by familydoctor.org editorial staff

Reviewed/Updated: 02/14
Created: 01/96

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