- It takes about two weeks for your body to produce antibodies. That means if you get the flu virus shortly before getting the flu shot or during those two weeks, you’ll still get sick. If you’ve ever said or heard someone say, "I got the flu shot and got sick the next day!" that’s what probably happened.
- That said, the flu shot has a high effectiveness rate. It covers the major flu strains for the season.
- If you do end up getting one of the major strains, it often is a milder version of the flu than you would have otherwise gotten.
- Getting the flu shot also helps prevent you from spreading the flu to others, especially more susceptible people like the elderly or very young children.
For more information, contact your local health department, and be sure to use these CDC links for help as well: