The statement reads: “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 where necessary.
“The PM is receiving excellent care, and thanks all NHS staff for their hard work and dedication.”
Professor Derek Hill, professor of medical imaging, University College London (UCL), said: “It seems clear that the Prime Minister went to hospital because he had difficulty breathing. It seems he was initially put on oxygen, and was conscious.
“But as often happens with Covid-19, his condition has now deteriorated so he has been admitted to intensive care where he is very likely to have been put on a mechanical ventilator to breath for him.”
Dr Hill added: “It isn’t yet clear whether Boris Johnson is breathing on his own – with help from the ventilator. Or whether he has been heavily sedated and paralysed and the machine is doing all the breathing for him.”
The news was confirmed on Twitter by BBC’s political editor Laura Kuenssberg.
Her tweet read: “The Prime Minister has been taken to intensive care.”
Public and political figures have come forward to offer their well wishes for the Prime Minister.
Former Labour leader Jeremy Corbyn tweeted: “My thoughts are with Boris Johnson and his family tonight. Thanks to the #NHS staff for their hard work and dedication.”