Why should I receive a flu shot? The single best way to prevent the flu is to get a flu shot each season. Tell me more about the vaccine. The flu vaccine is highly effective, and adverse side effects are rare. Protection usually develops within two weeks of vaccination. There are two types of flu vaccines:
- The flu shot: an inactivated vaccine (containing killed virus) that is given with a needle. The seasonal flu shot is approved for use in people six months of age and older, including healthy people, people with chronic medical conditions and pregnant women. You cannot get the flu from the flu shot.
- The nasal-spray flu vaccine: a vaccine made with live, weakened flu viruses that do not cause the flu. This vaccine is approved for use in healthy people, ages 2-49 who are not pregnant.