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Text: The effectiveness and duration of protection provided by the flu shot can vary from year to year due to the ever-evolving nature of influenza viruses. Generally, the flu shot is designed to provide immunity for a single flu season, which typically lasts from October to March. During this time, the vaccine helps the immune system recognize and combat prevalent strains of the influenza virus.

It's important to note that the flu shot's efficacy may decline over time, and new vaccine formulations are recommended annually to address changes in the circulating flu strains. For optimal protection, healthcare professionals advise individuals to receive the flu shot at the beginning of each flu season. Staying informed and proactively getting vaccinated contributes to a community-wide effort to prevent the spread of the flu.