FILE PHOTO: Syringes filled with a doses of Pfizer’s coronavirus disease (COVID-19) vaccine are seen at a pop-up community vaccination center at the Gateway World Christian Center in Valley Stream, New York, U.S., February 23, 2021. REUTERS/Brendan McDermidWASHINGTON (Reuters) – Pfizer Inc and BioNTech have asked U.S. regulators to approve emergency use of their COVID-19