A panel of vaccine experts has voted unanimously to recommend authorization of Johnson & Johnson’s COVID-19 vaccine, setting it up for the Food and Drug Administration to allow its release within hours.

The vaccine, developed by Johnson & Johnson-owned Janssen Pharmaceuticals, takes a single shot to provide the full measure of protection from illness due to COVID-19. The Pfizer and Moderna vaccines already in use in the United States require two shots spaced out by three weeks and four weeks, respectively. The Johnson & Johnson vaccine is also much easier to store and transport than other vaccines because it doesn’t require ultracold temperatures to keep it viable for up to three months.