Two Both vaccines protect against the three most widely circulating flu virus strains.
1. The 'flu shot' contains inactivated (killed viruses). It is given with a needle, usually in the arm. The flu shot can be given to people over 6 months of age, including healthy people and those with chronic medical conditions.
2. The nasal-spray flu vaccine (often called LAIV for Live Attenuated Influenza Vaccine, brand name FluMist) contains weakened live viruses, and is sprayed into both nostrils. It can only be given to healthy people between the ages of 2 and 49 years who are not pregnant.