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influenza vaccine
influenza vaccine An immunization against certain types of the influenza virus. The “flu shot” is an inactivated vaccine (containing killed virus) given with a needle. The nasal-spray flu vaccine is a vaccine made with live, weakened flu viruses (sometimes called LAIV for “Live Attenuated Influenza Vaccine”). The viruses in the vaccine change each year based on international surveillance and scientists’ estimations about which types and strains of viruses will circulate in a given year. Antibodies to the flu virus develop about 2 weeks after vaccination. See also influenza.