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A member of medical staff checks phials of the Pfizer-BioNTech Covid-19 vaccine in a refrigerator at University Hospital in Coventry, cental England, on December 8, 2020 as Britain starts its biggest ever vaccination programme. - Britain on December 8 hailed a turning point in the fight against the coronavirus pandemic, as it begins the biggest vaccination programme in the country's history with a new Covid-19 jab. (Photo by Jacob King / POOL / AFP) (KEYSTONE/POOL/JACOB KING)