Flu Shot: What You Should Know


Although many vaccines provide lifetime immunity to the flu, it must be administered annually. The reason is that every flu season differs and the flu shot protects against the influenza viruses that will be most prevalent that year.


How effective is the Flu Shot

"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 is affected by many factors, including age, previous flu shots, the circulating virus and your immune system."


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You can get the flu shot, but it doesn't mean you won’t get sick. Flu viruses change and evolve constantly, which makes it possible for them not to be protected by flu vaccines.

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According to the National Institute of Allergy and Infectious Diseases, flu shot effectiveness may also be affected if the flu vaccine is given to strains that are not compatible with the circulating flu strains.

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Although flu vaccines may not be 100% effective, those who have them are less likely than those who don't.


The CDC estimates that between 2010 and 2020, the yearly jab will have prevented 719,000 deaths in the United States.

"Even in years where the flu vaccine is not a good match, there is partial immunity because one's immune systems can make antibodies to recognize and bind with the influenza virus when new strains arise unexpectedly," states Kevin Harrod PhD, professor and infectious disease researcher at University of Alabama’s Heersink School of Medicine, Birmingham.

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