Flu prevention and vaccine information | Mass.gov

Although the flu vaccine wont prevent every case of the flu, getting an annual vaccination is the best way to reduce your risk of serious illness. Getting the flu vaccine may make illness milder. A 2017 study inClinical Infectious Diseases (CID)showed that influenza vaccination reduced deaths, intensive care unit (ICU) admissions, ICU length of stay, and overall duration of hospitalization among hospitalized influenza patients.

A flu shotcannotcauseflu illness.If you get flu-like symptoms after receiving the flu vaccine, there may be afew reasonswhy you have a low grade fever, and headache, including that they may be mild side-effects of the vaccine. If you get diagnosed with the flu shortly after receiving the flu vaccine, you may have been exposed to the flu virus beforehand, as it takes approximately two weeks for the vaccine to work.

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Flu prevention and vaccine information | Mass.gov