British Prime Minister Boris Johnson has tested positive for the new coronavirus, but remains in charge of the U.K.’s response to the outbreak. Johnson said Friday that he was tested for COVID-19 on the advice of the chief medical officer after showing “mild symptoms” involving a temperature and a persistent cough. “I’ve taken a test, that’s come out positive so I am working from home, I am self-isolating, and that’s entirely the right thing to do,” he said in a video message posted on his Twitter account.