The UK prime minister is understood to be conscious and was moved at about 7pm as a precaution should he require ventilation to aid his recovery.
Foreign secretary Dominic Raab will “deputise where necessary” while the prime minister is battling Covid-19, a No.10 spokesperson said.
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Asked by the BBC on Monday night if he was confident the government is “under control”, Raab said: “There’s an incredibly strong team spirit behind the prime minister, and [we are] making sure that we get all of the plans the prime minister’s instructed us to deliver to get them implemented as soon as possible.
“And that’s the way it will bring the whole country through the coronavirus challenge that we face right now.”
Buckingham Palace said the Queen is being kept informed about his condition.
Johnson, 55, was admitted to St Thomas’s Hospital in Westminster on Sunday after his coronavirus symptoms persisted for 10 days.
But, having been in hospital for tests and observation, his doctors advised that he be admitted to intensive care.
A spokesperson said: “Since Sunday evening, the prime minister has been under the care of doctors at St Thomas’s Hospital, in London, after being admitted with persistent symptoms of coronavirus.
“Over the course of this afternoon, the condition of the prime minister has worsened and, on the advice of his medical team, he has been moved to the intensive care unit at the hospital.
“The PM has asked foreign secretary Dominic Raab, who is the first secretary of state, to deputise for him...