Influenza vaccination. Elderly woman being injected with Enzira. This vaccine protects against flu, a contagious disease caused by influenza viruses that are transmitted in airborne water droplets through coughs or sneezes. The vaccination contains inactivated influenza virus particles, which stimulate the immune system to protect the body from flu without causing an infection. Due to the virus' ability to mutate into new strains, new vaccines are frequently needed.
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