How Long Does a Flu Shot Last?


Quick Answer

Flu shots provide protection for one flu season, although antibodies against the flu do not develop for about two weeks after initial vaccination, according to the U.S. Department of Health and Human Services. Vaccinated individuals are 60 percent less likely to need medical treatment for flu symptoms than unvaccinated individuals.

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Full Answer

Flu shots that provide protection against three strains of the flu, including A/H2N2, A/H1N1 and influenza B, are known as trivalent vaccines. Quadrivalent vaccines provide protection for the same flu strains as well as a second influenza B strain. Flu vaccinations are available for patients age 6 months or older. A flu vaccine that is administered via the nasal passages is also available, according to the Department of Health and Human Services.

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