"How does the flu vaccine work and help me?" Influenza vaccination. Tammie Henderson, FNP-C, Primary Care Provider at Riverside Healthcare, explains how the vaccine introduces a weakened version of the virus (not live) so your body builds antibodies. Hear about reduced risk (about 40–60% in a well-matched season), shorter illness duration, milder symptoms if you still get sick, and common post-vaccine reactions like arm soreness or low-grade fever.
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