(FILES) In this file photo taken on December 30, 2020 vials of undiluted Pfizer COVID-19 vaccine are prepared to administer to staff and residents at the Goodwin House Bailey&amp;#39;s Crossroads, a senior living community in Falls Church, Virginia. - Pfizer has agreed to move up deliveries of its Covid-19 vaccine to Canada, Prime Minister Justin Trudeau said March 30, 2021, one day after restricting AstraZeneca jabs over safety concerns. (Photo by Brendan Smialowski/AFP)