Johnson's office says he left St. Thomas' Hospital and will continue his recovery at Chequers, the prime minister's country house. He will not immediately return to work.

Johnson has been in the hospital for a week and spent three nights in the ICU.

THIS IS A BREAKING NEWS UPDATE: AP's earlier story is below:

British Prime Minister Boris Johnson said he owes his life to the National Health Service staff who treated him for COVID-19, ahead of figures Sunday in which the U.K. is expected to surpass 10,000 coronavirus-related deaths.

"I can't thank them enough," Johnson said in his first public statement since he was moved out of intensive care Thursday night at St. Thomas' Hospital in London. "I owe them my life."

Johnson, 55, was diagnosed over two weeks ago, becoming the first world leader confirmed to have the illness. His coronavirus symptoms at first were said to have been mild, including a cough and a fever, and he was working from home during the first few days.

But he was admitted to St. Thomas' on April 5 after his condition worsened and he was transferred the following day to its intensive care unit, where he received oxygen but was not put onto a ventilator. He spent three nights there before moving back to a regular hospital ward.

While he convalesces, Johnson has asked Foreign Secretary Dominic Raab to handle the nation's response to the pandemic that has infected at least 1.78 million worldwide and killed 109,000 people. Experts say those numbers seriously understate the impact of the pandemic, due to limited testing and different ways of counting the dead.

Britain has been in effective lockdown since March 23 and the government is set to extend the restrictions sometime next week.

But Johnson's Conservative government has come under fire for its slow response to confronting the pandemic — allowing tens of thousands to gather at the Cheltenham horse racing festival in mid-March, for example. It's also faced criticism for its slow rollout of a coronavirus testing program.

Over the past few days, the government has also faced acute criticism for the lack of personal protective equipment for frontline workers in hospitals, amid reports that some nurses have had to resort to cutting up garbage bags to cover themselves.

Health Secretary Matt Hancock revealed Saturday that 19 frontline workers have died from the virus.

The Royal College of Nursing has piled more pressure on the government, urging members to refuse to treat patients as a "last resort" if adequate protections are not provided.

Business Secretary Alok Sharma stopped short Sunday of apologizing for the lack of medical masks and gowns but said it is "absolutely right that no medical professional should be placed in a position where they have to make that choice."

"That is why we are making sure we get the equipment to the frontline," he told Sky News.

Figures later Sunday are expected to show that over 10,000 people in the U.K. have died after testing positive for coronavirus. That would make Britain the fourth European country after Italy, Spain and France to reach that grim milestone, even with its limited testing.

On Saturday, Britain reported 917 new coronavirus-related deaths in its hospitals for an overall death toll of 9,875.

With Britain's death toll increasing at such a rapid daily pace, and the virus death tolls in Italy and Spain on a downward slope, there are growing fears that the U.K. will end up being the country with the most virus deaths in Europe. The continent has had almost 74,000 reported coronavirus deaths.

Last week, the British government's chief scientific adviser, Patrick Vallance, warned that the daily number of deaths would likely increase for a couple more weeks.

Sharma refused to be drawn in on whether the U.K. will end up with the highest death toll in Europe.

"We are at different trajectories," he said told the BBC. "We are starting to see these measures work."