British Prime Minister Boris Johnson has tested positive for coronavirus and is self-isolating but will still lead the government’s response to the outbreak. [ Sign up for our Health IQ newsletter for the latest coronavirus updates ] “Over the last 24 hours I have developed mild symptoms and tested positive for coronavirus,” Johnson said. “I am now self-isolating, but I will continue to lead the government’s response via video-conference as we fight this virus.” This is a breaking news story.