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Virus

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By Jeannette Curtis; Caroline Rea, RN, BS, MS

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A virus is a microscopic organism that causes infection and disease. Viral illnesses can range from mild to severe, including examples such as the common cold, West Nile virus, polio, and smallpox.

Author:Jeannette Curtis
Caroline Rea, RN, BS, MS
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Last Updated: 05/25/2007
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