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(FILES) In this file photo taken on January 4, 2021, a vial of the AstraZeneca/Oxford Covid-19 vaccine is pictured at the Lochee Health Centre in Dundee. - Anglo-Swedish pharmaceutical giant AstraZeneca, January 30, 2021, has become a headache, with questions about its effectiveness, and potential litigation because of delays in delivery to the European Union. (Photo by Andy Buchanan / POOL / AFP) (KEYSTONE/POOL/ANDY BUCHANAN)