LONDON (AP) — British Prime Minister Boris Johnson has tested positive for the new coronavirus, the first leader of a major nation to contract COVID-19, but he insisted Friday that he remains in charge of the U.K.’s response to the outbreak.

Two of Johnson’s top aides in the fight against the virus — his health secretary and top medical adviser — also said they had the disease.

Johnson, 55, said he was tested Thursday after showing “mild symptoms”: 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,” Johnson said in a video message posted on his Twitter account.

“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.”