Skip to main content

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

Page last updated 12 October 2018

Each year, the influenza virus changes. Therefore, the vaccine that was made to combat last year’s strains are no longer effective (or as effective) against the current year’s strains. 

The way current flu vaccines work, the body’s immune response to the flu vaccine reduces over time, so annual vaccination is required to ensure you have optimal protection.

Sources & Citations

  1. Centers for Disease Control. Key facts about seasonal flu vaccine. Available at: (accessed 16 April 2018).