Skip to main content

Why do we need the flu shot every year?

Page last updated 06 May 2019

Each year, the influenza virus changes. Therefore, the vaccine that was made to combat last year’s strains will be no longer effective (or as effective) against the current year’s strains. In addition, these antibody levels reduce 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).