Which seasonal influenza vaccines are used in the US?

Updated: Apr 23, 2019
  • Author: Hien H Nguyen, MD, MS; Chief Editor: Michael Stuart Bronze, MD  more...
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Answer

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.


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