2013 Flu News
(1/29/2013) What causes influenza?
Influenza (also known as the flu or "gripe", in Spanish) is a contagious respiratory illness caused by flu viruses. Two basic types of virus circulate in the United States, group A and group B. Influenza A may cause moderate to severe illness in all age groups and infects humans and other animals. Influenza B causes milder symptoms and affects only humans, primarily children.
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CDC Fact Sheet on Flu (in English and Spanish)
