British PM Boris Johnson tests positive for COVID-19, names a 'designated survivor'

British Prime Minister Boris Johnson has revealed that he tested positive for coronavirus.

What are the details?

In a Friday video announcement shared on Twitter, Johnson said that he is still working but has self-isolated.

Johnson named U.K. Foreign Secretary Dominic Raab as his "designated survivor" should he become seriously ill.

Johnson, 55, said he is experiencing "mild symptoms" of COVID-19, but vowed to continue working from home and leading the U.K.'s response to the coronavirus pandemic.

He tweeted with the video, "Over the last 24 hours I have developed mild symptoms and tested positive for coronavirus. I am now self-isolating, but I will continue to lead the government's response via video-conference as we fight this virus. Together we will beat this. #StayHomeSaveLives."

Such mild symptoms include an elevated temperature and a cough.

"I'm working from home and self-isolating, and that's entirely the right thing to do," he said. "But, be in no doubt that I can continue thanks to the wizardry of modern technology to communicate with all my top team to lead the national fightback against coronavirus.

"I want to thank everybody involved and, of course, our amazing NHS staff," he added.

There are more than 11,816 confirmed cases of coronavirus in the United Kingdom at the time of this writing. At least 580 people have died because of the virus.