British Prime Minister Boris Johnson has been moved to intensive care after his COVID-19 symptoms worsened, Sky News reported on Monday, quoting Downing Street source.

Johnson tested positive for COVID-19 on March 27 and he then began self-isolation at home.

His Downing Street office said in a statement on Sunday that his condition did not improve after ten days and he is still suffering from a persistent coughing and fever.

He was sent to intensive care unit on Monday afternoon, but was still conscious, according to a spokesperson with Downing Street.

Boris has asked Foreign Secretary Dominic Raab to deputize where necessary.

The death toll of those hospitalized in Britain who tested positive for the novel coronavirus reached 5,373 as of Sunday afternoon, a daily increase of 439, the U.K. Department of Health and Social Care said Monday.

As of Monday morning, the number of confirmed cases of COVID-19 in Britain hit 51,608, up 3,802 in the past 24 hours, said the department.