DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Influenza vaccination being administered into a patient's arm. The vaccination provides long-term protection against the strains of influenza (flu) thought to be the most likely to be in circulation the following winter. The injection contains fragments of killed influenza viruses. It prepares the immune system in case of real infection and strengthens the immune response.
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