How often is it recommended for individuals to receive a flu vaccine?

The recommendation to receive a flu vaccine annually is based on the nature of the influenza virus, which can change from year to year. Vaccines are formulated each year to provide protection against the most common strains circulating during the upcoming flu season. This annual updating is necessary because the effectiveness of the vaccine can diminish over time, and immunity can wane. Additionally, as new strains emerge, vaccination each year ensures that individuals are offered the most effective protection tailored to the current flu season's viral composition.

This practice is particularly important for high-risk populations, such as the elderly, young children, pregnant women, and individuals with certain chronic health conditions, as they are more vulnerable to serious complications from the flu. Therefore, receiving the vaccine every year is crucial to maintaining a strong defense against influenza and reducing the likelihood of severe illness.