SATURN STILLS / SCIENCE PHOTO LIBRARY SATURN STILLS / SCIENCE PHOTO LIBRARY
POSED BY MODEL. Flu vaccine. Doctor holding a syringe containing the influenza (flu) vaccine. The vaccine consists of dead strains of the influenza virus. These trigger the body's immune system into producing antibodies that will attack any flu viruses that invade the body. An annual flu vaccination is recommended for the elderly and people with respiratory or circulatory diseases.
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