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Virus
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Healthwise
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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