The Flu and You: What You Should Know

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  • Influenza, Flu

How Do Flu Vaccines Work?

Flu vaccines come in either a shot or nasal spray formula. They cause antibodies to develop in the body that help protect against infection, and it takes about two weeks for the vaccination to start working. There are three common flu viruses: influenza B, influenza A (H1N1), and influenza A (H3N2). Each year, one flu virus of each kind is used to make flu vaccines. 

(Photo: REUTERS/Jessica Rinald)

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