FDA approved FluMist nasal spray flu vaccine for ages 2-49, available online for home administration, aiming to boost declining vaccination rates. FluMist, initially approved in 2003, is now self-administered or by a caregiver, potentially capturing those avoiding shots due to needle fear or scheduling issues. Common side effects include runny nose, nasal congestion, and sore throat. Not approved for adults 50+, as immune systems weaken with age, necessitating high-dose vaccines for seniors.