JIM VARNEY / SCIENCE PHOTO LIBRARY JIM VARNEY / SCIENCE PHOTO LIBRARY
Influenza vaccination. Doctor preparing to administer an influenza vaccine to an elderly man. The vaccination provides protection against the strains of the influenza (flu) virus that are most likely to be in circulation during the following winter. The syringe contains fragments of killed viruses. These prime the immune system, allowing it to react quickly in case of a real infection.
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