influenza A virus A/Delaware/39/2019 (H3N2) antigen / influenza A virus A/Nebraska/14/2019 (H1N1) antigen / influenza B virus B/Darwin/7/2019 antigen / influenza B virus B/Singapore/INFTT-16-0610/2016 antigen Prefilled Syringe [Flucelvax Quadrivalent 2020-2021]