An influential Food and Drug Administration advisory committee plans to meet Sept. 17 to discuss extra doses of the COVID-19 vaccines, including the application filed by BioNTech SE /zigman2/quotes/214419716/composite BNTX -5.77% and Pfizer Inc. /zigman2/quotes/202877789/composite PFE -2.33% for a third dose of their COVID-19 shot. Moderna Inc. /zigman2/quotes/205619834/composite MRNA -4.45% on Wednesday also submitted its application for a booster dose of its COVID-19 vaccine. The FDA's Vaccines and Related Biological Products Advisory Committee traditionally recommends whether the FDA should authorize or approve a vaccine or drug. The regulator is not required to follow the advice of the committee but it often does. The Biden administration previously said that COVID-19 booster shots will be available to adults starting Sept. 20, though availability will be dependent on a stamp of approval from the FDA and the Centers for Disease Control and Prevention. "The FDA will review the supplemental application as expeditiously as possible, while still doing so in a thorough and science-based manner," Dr. Peter Marks, the director of the FDA's Center for Biologics Research and Evaluation, said in a statement on Wednesday.