Johnson, 55, was taken to St Thomas’s Hospital in central London a week ago, suffering from persistent symptoms of the disease caused by the new coronavirus. On April 6 he was moved into intensive care, where he remained until April 9.

“I can’t thank them enough. I owe them my life,” Johnson said of the staff at the hospital, which is just across the River Thames from the Houses of Parliament. The comments were released to journalists and confirmed by his office on Sunday.

Johnson was back on his feet by Friday, taking short walks between periods of rest, in what his office described as the early stage of recovery.

Britain’s Covid-19 death toll neared 10,000 on Saturday, the fifth highest national number globally, after officials reported another 917 hospital deaths.

In its most recent official update on Johnson’s condition, Downing Street said he “continues to make very good progress”.

Priti Patel, the interior minister, said in Saturday’s daily government news briefing that he needed time to rest and recover before returning to work.