The Duke of Edinburgh’s health remains under watch as the 91-year-old undergoes treatment for a recurring bladder infection in hospital this week.

General view of police outside Aberdeen Royal Infirmary, where Britain's Prince Philip has been hospitalised on August 15, 2012. Photo: Getty

The Palace released a statement on Thursday on Prince Philip’s health: “The Duke of Edinburgh is responding well to treatment. It is unclear when he will be discharged, but he is likely to remain in hospital for a few more days.”

The Queen’s husband was taken to Aberdeen Royal Infirmary on Wednesday as a “precautionary measure” according to the Deputy Press Secretary to The Queen.

Prince Philip was in hospital for five days in June for a bladder infection, which seems to have returned. And in December he was admitted for a coronary stent procedure to clear a blocked artery.