LONDON (AP) — British Prime Minister Boris Johnson has been moved to the intensive care unit of a London hospital after his coronavirus symptoms worsened.

Johnson’s office says Johnson is conscious and does not require ventilation at the moment. Johnson was admitted to St. Thomas’ Hospital late Sunday, 10 days after he was diagnosed with COVID-19.

Johnson has asked Foreign Secretary Dominic Raab to deputize for him.

“Over the course of this afternoon, the condition of the Prime Minister has worsened and, on the advice of his medical team, he has been moved to the Intensive Care Unit at the hospital,” his office said in a statement.