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# Seqirus Afluria Quadrivalent Flu Vaccine Approved
- URL: https://www.fdaweb.com/seqirus-afluria-quadrivalent-flu-vaccine-approved/
- Published: 2016-08-29T12:00:00.000Z
- Updated: 2026-09-14T21:27:22.000Z
- Author: David McFarland
- Tags: Biologics, #legacy-id-D5136641

FDA has approved a Seqirus BLA for Afluria Quadrivalent (influenza vaccine) for use in those 18 years of age and older for active immunization against influenza disease caused by influenza A subtype viruses and type B viruses contained in the vaccine. The product comes in single-dose, preservative-free pre-filled syringes. The traditional seasonal influenza vaccine is a trivalent formula consisting of two strains of influenza A viruses and a single strain of influenza B virus, according to the company. The use of the four-strain Afluria Quadrivalent adds protection against a second type B virus, it says.