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virus

a virus is a microscopic organism that causes infection and disease. viral illnesses can range from mild to severe. some examples are the common cold, west nile virus, polio, and smallpox.

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this information does not replace the advice of a doctor. healthwise, incorporated, disclaims any warranty or liability for your use of this information. your use of this information means that you agree to the terms of use and privacy policy. to learn more about healthwise, visit healthwise.org. © 1995-2022 healthwise, incorporated. healthwise, healthwise for every health decision, and the healthwise logo are trademarks of healthwise, incorporated.

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