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Contents

  • Understanding the Flu Shot
    • How the Flu Shot Works
      • Duration of Protection
        • Initial Immune Response
          • Peak Effectiveness Period
            • Waning Immunity
            • Factors Affecting Duration
              • Maintaining Protection
                • When to Consider Revaccination

                  Duration of Flu Shot Effectiveness: How Long Does It Last?

                  contributorcontributorcontributor
                  2.4 minute read
                  HealthMedicineBiologyScience
                  A close-up image of a calendar marked with a flu shot reminder, surrounded by autumn leaves and a stethoscope.
                  Published January 19, 2025
                  Last Updated May 29, 2025
                  contributorcontributorcontributor
                  2.4 minute read

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