Boris Johnson is able to walk again after he was moved back from intensive care to a hospital ward, Downing Street says.
A statement from Number 10 said: "The prime minister has been able to do short walks, between periods of rest, as part of the care he is receiving to aid his recovery.
"He has spoken to his doctors and thanks the whole clinical team for the incredible care he has received.
"His thoughts are with those affected by this terrible disease."
Fears grew for his health when his symptoms worsened and he was transferred to intensive care the following day.
He spent three nights there before Downing Street confirmed he was in the "early phase of his recovery" and moved back to a normal hospital ward.
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Mr Johnson waved his thanks to NHS doctors and nurses as he left the intensive care unit, his spokesman confirmed on Friday.
But they said it was too early to say how long he would need to stay in hospital.
"Decisions such as this will be on the advice of his medical team. They have given him brilliant care," the spokesman added.
On Friday, it was confirmed the daily rise in UK deaths of hospital patients who have COVID-19 was 980 – surpassing Spain's highest total of 961.
The death toll in UK hospitals is now 8,958.
Foreign Secretary Dominic Raab is deputising for the prime minister in his absence.