British Prime Minister Boris Johnson (L) is given the Oxford-AstraZeneca COVID-19 vaccine by a nurse at St Thomas’ Hospital in London, Britain, March 19, 2021. British Prime Minister Boris Johnson received his first dose of the Oxford-AstraZeneca COVID-19 vaccine on Friday after reassuring the public it is “safe”. (Andrew Parsons/No 10 Downing Street/Handout via Xinhua)