U.K. Prime Minister Boris Johnson left intensive care on Thursday evening as he continues to recover from COVID-19, but he remains under close observation in hospital, his office said on Thursday.

Johnson, 55, was admitted to St Thomas' Hospital on Sunday evening with a persistent high temperature and cough, and was rushed to intensive care on Monday where he spent three nights receiving treatment.

"The prime minister has been moved this evening from intensive care back to the ward, where he will receive close monitoring during the early phase of his recovery," a spokesman from his office said in an emailed statement.