How often should the influenza vaccine be administered?

The influenza vaccine should be administered once a year. This annual vaccination is recommended because the influenza virus can change from year to year, and vaccine formulations are updated to provide the best protection against the currently circulating strains. Immunity from the vaccine may decline over time, which is why yearly vaccination is necessary to ensure adequate protection during the flu season.

Vaccinating annually not only helps protect individuals from the flu but also contributes to community immunity, reducing the potential spread of the virus. This approach is supported by health organizations and is a critical strategy in public health to minimize flu-related illnesses and complications.