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National Institutes of Health's National Institute of Allergy and Infectious Diseases (NIAID)
The National Institute of Allergy and Infectious Diseases (NIAID) conducts and supports basic and applied research to better understand, treat, and ultimately prevent infectious, immunologic, and allergic diseases.
CDC: Flu (Influenza)
The CDC's site has up-to-date information on flu outbreaks, immunizations, symptoms, prevention, and more.