All flu vaccines available in the US for the 2022-2023 season are quadrivalent vaccines, which are designed to protect against four different flu viruses—two influenza A viruses and two influenza B viruses. New for the 2022-2023 flu season, 3 flu vaccines are preferentially recommended for adults age 65 years and older: Quadrivalent high-dose.

specifically : to make (a living organism) immune or resistant to a disease or pathogenic agent especially by inoculation : to create immunity in (as with a vaccine) Measles can be almost completely controlled when adequate numbers of people within a population are immunized. Scientific American Medicine

Stay up-to-date on getting recommended vaccines. Here are immunization schedules for people of all ages and health care professionals to use. Get CDC recommended immunization schedules for people of all ages.