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Influenza (seasonal flu)

Influenza is a highly contagious viral respiratory infection, and is spread by respiratory droplets that are released into the air when an infected person coughs, sneezes, or talks. Infected persons can spread the flu to others up to 6 feet away. The flu has an incubation period of 24 to 48 hours after exposure. There are three main types of influenza (A, B, C). Type A is most able to change its structure from year to year, giving it the ability to produce widespread outbreaks. Because Type A so frequently changes its structure, a new type of vaccine is required each year to protect against the strains of the virus that are circulating that year. The disease is usually self-limited (resolves without treatment), but can be fatal in the very young, very old, or if there is a coexisting depression of the immune system. It sometimes can be difficult to tell the difference between a cold and the flu based on symptoms alone. In general the flu is worse than the common cold and symptoms such as fever (usually over 101F) and body aches are more severe with the flu. For more information: http://www.flu.gov
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