How Do Flu Vaccines Work?

Flu vaccines (flu shot or nasal spray) cause antibodies to develop in the body. These antibodies provide protection against infection with the viruses that are in the vaccine. It takes about 2 weeks after vaccination for antibodies to develop and provide protection. Meanwhile, you are still at risk for getting the flu. That’s why it’s better to get vaccinated early in the fall, before the flu season really gets under way.

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