Which seasonal influenza vaccines are used in the US?

Updated: Aug 07, 2020
  • Author: Hien H Nguyen, MD, MS; Chief Editor: Michael Stuart Bronze, MD  more...
  • Print

Each year in the United States, a vaccine that contains antigens from the strains most likely to cause infection during the winter flu season is produced; 2 strains of influenza A and 1 of influenza B are included for trivalent vaccinees. [8] The quadrivalent flu vaccines have an additional B virus.

Did this answer your question?
Additional feedback? (Optional)
Thank you for your feedback!