14 (UPI) -- The incoming Biden administration's plan to release more doses of the COVID-19 vaccine won't cause supply shortages, Dr. Celine Gounder, a member of the newly created COVID-19 advisory board said Thursday. Two COVID-19 vaccines, made by Pfizer-BioNTech and Moderna, have been approved for use in the United States, and both require two doses for maximum effectiveness. Through Thursday, nearly 30 million doses of the two vaccines had been distributed across the country, but fewer than 11 million have been administered, based on estimates from the U.S.