U.K. Prime Minister Boris Johnson has become the first world leader to say he has tested positive for the novel coronavirus.

Johnson will self-isolate in Downing Street for seven days after a test on Thursday found he had the virus, his spokesman James Slack told reporters on Friday. Meals will be left at Johnson’s door while he continues to work by video-conference, Slack said.

"I’ve developed mild symptoms of the coronavirus, that’s to say a temperature and a persistent cough,” Johnson said in a video posted on Twitter. "Be in no doubt I can continue, thanks to the wizardry of modern technology, to communicate with all my top team, to lead the national fightback against coronavirus.”