On average, people who get the flu shot are between 40% and 60% less likely to catch the virus than unvaccinated individuals. So, although the flu shot may not prevent all cases of influenza, it helps protect you from severe infection and death and can help reduce the spread of the virus in communities.1 Nov 2021
Does flu vaccine lose effectiveness?
Researchers need to select the specific influenza viruses to include in the vaccine many months before flu season begins. This means what's in the vaccine may not always match what's actually circulating during flu season. This can decrease the effectiveness of the seasonal flu vaccine.
How effective is the influenza vaccine 2019?
Sixty-seven percent (n = 2079) received vaccination. Overall adjusted VE against influenza viruses was 41% (95% confidence interval [CI], 27%-52%). VE against A(H1N1)pdm09 viruses was 40% (95% CI, 24%-53%) and 33% against B viruses (95% CI, 0-56%).1 Sept 2021
What is the effective rate of this year's flu vaccine?
The flu vaccine was 39% effective in reducing the risk of illness during the 2019-20 flu season, according to the CDC. That percentage may seem low, Vyas says, but it's still important to get vaccinated.25 Oct 2021