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# FDA Approves Protein Sciences BLA for Flublok Quadrivalent
- URL: https://www.fdaweb.com/fda-approves-protein-sciences-bla-for-flublok-quadrivalent/
- Published: 2016-10-11T12:00:00.000Z
- Updated: 2026-09-14T21:38:48.000Z
- Author: David McFarland
- Tags: Biologics, #legacy-id-D5137047

FDA has approved a Protein Sciences BLA for its quadrivalent formulation of [Flublokinfluenza vaccine](http://www.flublok.com/?ref=fdaweb.com), which protects against four strains of influenza, three of the same strains found in trivalent Flublok plus an additional B strain. Approval was based on data from a clinical study of 9,000 adults 50 years of age and older, which showed that those who received Flublok Quadrivalent were over 40% less likely to get cell-culture confirmed influenza than those that received a leading egg-produced quadrivalent flu vaccine, according to the company. The vaccine is approved for adults 18 and older and will be available in pre-filled syringes beginning in 2017.