new versions of the flu vaccine this season
You'll see new versions of the flu vaccine this season.
FluMist is now a "quadrivalent" vaccine. It protects against 4 flu virus strains instead of the usual 3...to provide more coverage.
Fluarix, FluLaval, and Fluzone will come in BOTH quadrivalent and trivalent versions. All the other flu shots will be trivalent this year.