FILE – In this file photo dated Wednesday, July 22, 2020, a Pfizer sign is seen on a podium at the Pfizer Research & Development Laboratories, in Groton, USA. The U.K. health authorities rolled out a national mass vaccination program Tuesday Dec. 8, 2020, using the Pfizer-BioNTech COVID-19 vaccine. U.K. regulators said Wednesday Dec. 9, 2020, that people who have a “significant history’’ of allergic reactions shouldn’t receive the new Pfizer/BioNTech vaccine while they investigate two adverse reactions that occurred on the first day of the country’s mass vaccination program. (AP Photo/Stew Milne)