The flu comes every year. It is estimated that between 5% and 20% of Americans get it each year. Most people get over it with no problems. The Center for Disease Control estimate that in the U.S. more than 200,000 people are hospitalized and about 36,000 people die from the flu and its complications every year.
The flu virus was identified in the 1930s. It probably existed for a long time before that. Scientists classify influenza viruses into type A, B, and C – yes this was the best they could come up with.
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