There are 16 different flu shots approved by the FDA, made by several pharmaceutical companies. Some of these vaccines are designed solely to protect against the H1N1 influenza virus A strain. But most flu vaccines distributed in the U.S. are designed to provide protection from three strains of influenza viruses: two strains of type A influenza viruses, and one strain of type B influenza virus. The strains are chosen every year by the World Health Organization and the Centers for Disease Control, based on a best guess as to the greatest threat in any given year.
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