FluMist is a nasal spray vaccine used to protect against the seasonal influenza virus. It contains weakened live viruses that stimulate the immune system to produce antibodies, helping the body fight off infections. FluMist is typically recommended for healthy individuals aged 2 to 49 years. The vaccine is administered as a spray into each nostril and does not require a needle, making it a convenient option for those who may be afraid of injections. It is important to receive the vaccine annually, as the influenza virus can change from year to year, and immunity may decrease over time.