British Prime Minister Boris Johnson was admitted to hospital for tests on Sunday in what Downing Street said was a “precautionary step” because he was showing persistent symptoms of coronavirus 10 days after testing positive for the virus.

Johnson, who was isolating in Downing Street after testing positive in March, still had a high temperature and so his doctors felt he should go to hospital for tests. He remains in charge of the British government, his Downing Street office said.

In this video, UK Prime Minister Boris Johnson said he tested positive for coronavirus:

“On the advice of his doctor, the prime minister has tonight been admitted to hospital for tests,” Downing Street said.

“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.

News of his hospitalisation came only after an hour after Queen Elizabeth delivered a rallying call to the British public saying they would overcome the coronavirus outbreak if they stayed resolute.

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.