Why do I need an influenza vaccine every year?

Question: 
Why do I need an influenza vaccine every year?
 
Answer: 
It's important that you get the vaccine every year because: 
 
  • Influenza viruses are constantly changing (mutating), so each year the viruses used to make the vaccine change to protect you against the viruses circulating that year.
  • Protection from the influenza vaccine can wear off with time, so you need a new one every year to stay protected. 
Date last reviewed: 
Wednesday, Nov 03, 2021