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What are flu vaccines made of and why?

March 14, 2018

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Flu shots contain numerous ingredients in very small quantities. They often include a deactivated flu virus. Each of the ingredients work together to ensure that the vaccine is safe and effective.

Influenza viruses are always changing, which means that the flu vaccine is updated every year. The Centers for Disease Control and Prevention (CDC) recommend that everyone over 6 months of age (with some exceptions) should have a flu vaccine each year.

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