U.K. Prime Minister Boris Johnson looks at the newly authorized AstraZeneca/Oxford University COVID-19 vaccine.

WREXHAM, WALES – NOVEMBER 30: UK Prime Minister Boris Johnson poses for a photograph with a vial of the AstraZeneca/Oxford University COVID-19 candidate vaccine, known as AZD1222, at Wockhardt’s pharmaceutical manufacturing facility on November 30, 2020 in Wrexham, Wales. The UK government announced a deal in August with global pharmaceutical and biotechnology company Wockhardt, to increase capacity in a crucial part of the manufacturing process for Covid-19 vaccines. Britain has been Europe’s worst-hit country during the pandemic, recording more than 57,000 deaths from some 1.6 million cases. (Photo by Paul Ellis – WPA Pool/Getty Images)