A file photo dated on March 18, 2020 shows British Prime Minister Boris Johnson leaving Number 10 at Downing Street, London. British Prime Minister Boris Johnson tests positive for COVID-19. (Photo by Ray Tang/Anadolu Agency via Getty Images)
A file photo dated on March 18, 2020 shows British Prime Minister Boris Johnson leaving Number 10 at Downing Street, London. British Prime Minister Boris Johnson tests positive for COVID-19. (Photo by Ray Tang/Anadolu Agency via Getty Images)