“The prime minister is still at hospital,” a British government source said. “He spent the night in hospital.”
Johnson, who had been isolating in Downing Street after testing positive last month, was taken to hospital on Sunday night because he still had a high temperature and his doctors felt he needed additional tests.
“On the advice of his doctor, the prime minister has tonight been admitted to hospital for tests,” his Downing Street office said in a statement on Sunday.
“This is a precautionary step, as the prime minister continues to have persistent symptoms of coronavirus ten days after testing positive for the virus,” the statement added.
Johnson, 55, on March 27 became the first leader of a major power to announce that he had tested positive. He went into isolation at an apartment in Downing Street and said on Friday he was staying there as he still had a high temperature.