For seasonal influenza vaccination, which interval is recommended for adults?

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Multiple Choice

For seasonal influenza vaccination, which interval is recommended for adults?

Explanation:
Seasonal influenza vaccination is given once a year because both the virus and our immune protection change over time. The flu vaccine is reformulated annually to match the strains most likely to circulate in the coming season, and immunity from vaccination wanes over months. Vaccinating yearly ensures protection during the entire flu season. Intervals of every 3 months, every 24 months, or every 5 years don’t align with how quickly the virus evolves or how long vaccine-induced protection lasts, so they wouldn’t reliably protect adults.

Seasonal influenza vaccination is given once a year because both the virus and our immune protection change over time. The flu vaccine is reformulated annually to match the strains most likely to circulate in the coming season, and immunity from vaccination wanes over months. Vaccinating yearly ensures protection during the entire flu season. Intervals of every 3 months, every 24 months, or every 5 years don’t align with how quickly the virus evolves or how long vaccine-induced protection lasts, so they wouldn’t reliably protect adults.

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