How often should adults receive a flu vaccine, according to recommendations?

Adults are advised to receive a flu vaccine once a year to maintain effective protection against the influenza virus. This annual vaccination is necessary because influenza viruses are constantly changing, and each flu season may present different strains of the virus. The annual vaccine is formulated to match the most prevalent strains expected during the upcoming flu season, which means that yearly vaccination is essential to provide the best immunity.

Vaccination frequency is influenced by various factors, including age, health status, and past vaccination history, but in general, for most adults, receiving the flu vaccine once a year is standard practice in public health recommendations. This yearly approach helps ensure that individuals maintain adequate immunity levels and contribute to community immunity, which is particularly important for protecting those who are vulnerable or cannot be vaccinated.