5 things you need to know as Johnson & Johnson submits application for COVID vaccine FacebookTwitterEmail This Dec. 2, 2020 photo provided by Johnson & Johnson shows vials of the Janssen COVID-19 vaccine in the United States. On Thursday, Feb. 4, 2021, Johnson & Johnson has asked U.S. regulators to clear the world’s first single-dose COVID-19 vaccine, an easier-to-use option that could boost scarce supplies. (Johnson & Johnson via AP)Associated Press Johnson & Johnson has filed an application to the U.S. Food and Drug Administration for emergency use authorization of its one-dose COVID-19 vaccine. If approved, the vaccine produced by Janssen Pharmaceuticals, its Belgium-based subsidiary, would be the third COVID vaccine and first one-dose COVID vaccine available in the nation.