Britain's Prime Minister Boris Johnson speaks during a virtual press conference on the novel coronavirus COVID-19 pandemic, at 10 Downing Street in central London on January 22, 2021. - There is "some evidence" that the new strain of coronavirus identified in Britain is not only more transmissible but also more deadly, Prime Minister Boris Johnson said Friday. "It also now appears that there is some evidence that the new variant... may be associated with a higher degree of mortality," he said at a Downing Street press conference. (Photo by Leon Neal / POOL / AFP)