UK Prime Minister Boris Johnson says he has tested positive for coronavirus and is self-isolating. "Over the last 24 hours I have developed mild symptoms and tested positive for coronavirus," he said in a video posted to Twitter. "I am now self-isolating, but I will continue to lead the government’s response via video-conference as we fight this virus." A Downing Street spokesperson said: “After experiencing mild symptoms yesterday, the Prime Minister was tested for coronavirus on the personal