LONDON: The office of British Prime Minister Boris Johnson says he “continues to make very good progress” in a London hospital after contracting COVID-19.

The 55-year-old Johnson was diagnosed with COVID-19 more than two weeks ago, becoming the first world leader confirmed to have the illness. His office has said he’s taken “short walks” between periods of rest and had spoken to his doctors to thank them “for the incredible care he has received.”

His coronavirus symptoms at first were mild, including a cough and a fever. He was admitted to St. Thomas’ Hospital on Sunday after his condition worsened. He was transferred to the intensive care unit the following day where he received oxygen but was not put onto a ventilator.

He spent three nights there before moving back to a regular ward on Thursday night.