How often is the flu vaccine recommended?

The flu vaccine is recommended annually because the influenza virus undergoes frequent changes, leading to the emergence of new strains. Each year, public health organizations analyze data on circulating flu viruses to determine the most effective formulations for the upcoming flu season. This annual vaccination is crucial for providing optimal protection against the strains that are most likely to be prevalent. Additionally, immunity from the vaccine diminishes over time, so receiving the vaccine each year helps ensure that individuals maintain sufficient protection as flu season approaches. Regular yearly vaccination is a key component of public health efforts to reduce the incidence and severity of influenza, making it essential for anyone eligible to be vaccinated annually.