FILE - In this Tuesday, Feb. 23, 2021 file photo, a sign is pasted into an upper window at Pfizer manufacturing center in Puurs, Belgium. The European Union cemented its support for Pfizer-BioNTech and its novel COVID-19 vaccine technology, Saturday, May 8, 2021 by agreeing to a massive contract extension for a potential 1.8 billion doses through 2023. The new contract, which has the backing of the EU member states, will entail not only the production of the vaccines, but also making sure that all the essential components should be sourced from the EU. (AP Photo/Virginia Mayo, File) (Copyright 2021 The Associated Press. All rights reserved)