Flu Shot: What Do You Need To Know?


While most vaccines provide lifetime immunity (including flu vaccines), the vaccine for influenza must be administered once a year. Because every flu season is different, flu shots protect against the influenza viruses most likely to be found that year.


How effective are flu shots?

"In general, the flu vaccine will protect about two-thirds of persons who get it," says Jon McCullers, MD, the pediatrician-in-chief at Le Bonheur Children's Hospital in Memphis, Tennessee. "This can be modified by many factors such as age and previous flu vaccinations. It also depends on your immune system.


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Even though you have the flu shot, it does not mean that you won't catch the flu. Flu viruses are constantly evolving (mutating), making them possible to evade protections provided by flu vaccines.

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The National Institute of Allergy and Infectious Diseases states that flu shots can be less effective if the seasonal flu vaccine strains are not a good match for the circulating strains.

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Flu vaccines are not 100% effective. But, people who are immunized are more likely to get flu complications than those who aren’t.


According to the CDC it is estimated that the yearly jab has prevented 719,000 admissions and 60,000 deaths in America between 2010-2020.

"Even years in which the flu vaccine does not work, there is some protection, because your immune system can still produce antibodies that recognize the influenza virus and bind to it when new strains are discovered," says Kevin Harrod. Harrod is a professor at the University of Alabama's Heersink Medical School in Birmingham.

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