MICHAEL DONNE / SCIENCE PHOTO LIBRARY MICHAEL DONNE / SCIENCE PHOTO LIBRARY
Flu vaccination. Hand of a healthcare worker about to use a syringe to inject a flu (influenza) vaccine into a patient's arm. Influenza vaccines contain dead influenza viruses. When injected, the vaccine stimulates the body's immune system to produce antibodies that protect against future infection by live influenza viruses. Vaccinations against influenza are usually short-lived because the virus mutates into new forms. Vaccination is mostly recommended for the elderly and the young, or anyone with respiratory or circulatory disease.
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