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How does the flu vaccine work?
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The flu vaccine works by stimulating your immune system to produce antibodies against the flu virus. These antibodies help protect you from getting sick if you are exposed to the flu. The flu vaccine is made up of two main components: the inactivated flu virus and the live, attenuated influenza vaccine (LAIV). The inactivated virus is used to stimulate a strong response in the body’s immune system, while LAIV contains a weakened form of the virus that stimulates a milder response. Both forms of the vaccine contain the same antigens, but they differ in how they activate the immune system.