2. The quadrivalent flu vaccine protects against same trivalent flu vaccine and additional B virus.
A quadrivalent flu shot
Use in people were 6 months to young age.
An intradermal quadrivalent shot, which is
Injected into the skin instead of the muscle.
Use for people 18 through 64 years of age.
A quadrivalent nasal spray vaccine,
Use for people 2 through 49 years of age.