This credible eouugh for you
Misconceptions about Flu Vaccines
What about people who get a seasonal flu vaccine and still get sick with flu symptoms?
A third reason why some people may experience flu symptoms despite getting vaccinated is that they may have been exposed to a flu virus
that is very different from the viruses the vaccine is designed to protect against. The ability of a flu vaccine to protect a person depends largely on the similarity or “match” between the viruses selected to make the vaccine and those spreading and causing illness. There are many different flu viruses that spread and cause illness among people. For more information, see Influenza (Flu) Viruse