Boris Johnson is "stable" after spending the night in intensive care following his coronavirus symptoms worsening, Downing Street has said.

The Prime Minister's official spokesman said he had been receiving "standard oxygen treatment" but had not required any other assistance in breathing.

Mr Johnson was transferred to the intensive care unit at St Thomas' Hospital, London, last night, after his condition deteriorated.

His spokesman said the move was a "precautionary step" in case he needed to be put on a ventilator.

"The Prime Minister has been stable overnight and remains in good spirits," the spokesman said.

"He is receiving standard oxygen treatment and breathing without any other assistance.

"He has not required mechanical ventilation or non-invasive respiratory support."

Mr Johnson was originally admitted to St Thomas' on Sunday on the advice of his doctor after continuing to display symptoms of cough and high temperature ten days after testing positive for the virus.