Virus

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.

Last Updated: July 31, 2008

Author: Maria G. Essig, MS, ELS

Medical Review: Kathleen Romito, MD - Family Medicine & W. David Colby IV, MSc, MD, FRCPC - Infectious Disease

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