Influenza: Can I still get the flu after receiving the flu vaccine?
While you can still contract the flu if you are vaccinated, the flu vaccine lowers your risk of getting the flu by 40% to 60%. Flu vaccination has been shown to reduce severity of illness in people who get vaccinated but still get sick, and can reduce the risk of flu-associated hospitalization. Flu vaccination is also an important preventive tool for people with certain chronic health conditions. Flu vaccination during pregnancy helps protect pregnant people from the flu during and after pregnancy and protect their infants in their first few months of life. More information, including links to various studies, can be found here.