British Prime Minister Boris Johnson was in hospital on Monday undergoing tests after suffering “persistent” symptoms of coronavirus for 10 days, but colleagues insisted he remains in charge of the government. The Conservative leader announced on March 27 that he had tested positive for COVID-19, and has been self-isolating in his flat above Downing Street ever since. On Sunday evening, on the advice of his doctor, the 55-year-old was admitted to hospital for tests in what his office said was a “precautionary step”. He still has a high temperature among other symptoms, officials say.