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Why do I need to get vaccinated against the flu each year?

Page last updated 09 April 2020

There are two main reasons for getting a yearly flu vaccine:

  • Flu viruses are frequently changing and vaccines may be updated from one season to the next to protect against the most recent and common circulating strains
  • A person’s immune protection from influenza vaccination declines over time and annual vaccination is recommended.

Sources & Citations

10. Centers for Disease Control. Key facts about seasonal flu vaccine. Available at: (accessed 11 March 2020).

SPANZ.IFLU.18.04.0165(3)a Date of Preparation-  March 2020