JIM VARNEY / SCIENCE PHOTO LIBRARY JIM VARNEY / SCIENCE PHOTO LIBRARY
Influenza vaccination. Healthcare worker preparing an Enzira vaccine as the patient watches. This vaccine protects against flu, a 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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