Seasonal Influenza (Flu)

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According to the final full FluView for 2011-2012 season, flu activity in the U.S. is nearing summertime levels in most of the country. However sporadic activity can occur year-round and vaccination is still recommended for institutional outbreak control, for children needing their second dose and for some travelers. The 2011-2012 flu season was late and mild compared to most previous seasons for which surveillance data is available. (See 2011-2012 Flu Season Draws to a Close.)

Symptoms, How Flu Spreads, Higher Risk Groups, Past and Current Flu Season…

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There are many different influenza A viruses; some are found in humans and others in animals. Other flu sites include avian flu, swine flu, H3N2v flu, and pandemic flu.