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

Page last updated 28 January 2022

There are two main reasons for getting an influenza vaccine every year, to give you the best protection:

  • 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

8. Centers for Disease Control. Key facts about seasonal flu vaccine. Available at: (accessed 10 November 2021).


MAT-AU-2102449  Date of preparation January 2022