In adults at high risk for influenza, how often should vaccination be given?

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Multiple Choice

In adults at high risk for influenza, how often should vaccination be given?

Explanation:
Annual vaccination is recommended because influenza vaccines are reformulated each year to match circulating strains, and the protective immunity they provide wanes after a few months. For adults at high risk, getting vaccinated every year helps maintain protection throughout the flu season and reduces the risk of severe illness and complications. Vaccinating more frequently than once a year isn’t supported by guidelines and wouldn’t provide meaningful extra benefit, while waiting longer would leave individuals vulnerable to new strains and waning immunity.

Annual vaccination is recommended because influenza vaccines are reformulated each year to match circulating strains, and the protective immunity they provide wanes after a few months. For adults at high risk, getting vaccinated every year helps maintain protection throughout the flu season and reduces the risk of severe illness and complications. Vaccinating more frequently than once a year isn’t supported by guidelines and wouldn’t provide meaningful extra benefit, while waiting longer would leave individuals vulnerable to new strains and waning immunity.

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