SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Flu vaccine. A nurse injects a patient in the upper arm with a vaccine against seasonal influenza. Influenza vaccines contain dead influenza viruses. When injected, these stimulate the body's immune system to produce antibodies that protect against future infection by live viruses. Vaccination is recommended for the elderly and anyone suffering from respiratory or circulatory disease.
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