Police officers stand at an entrance to the King Edward VII Hospital where Prince Philip is being treated for an infection, as an ambulance is driven out, in London, Monday, March 1, 2021. (AP Photo/Frank Augstein)LONDON – Prince Philip was transferred Monday to a specialized London heart hospital to undergo testing and observation for a pre-existing heart condition as he continues to be treated for an unspecified infection, Buckingham Palace said. The 99-year-old husband of Queen Elizabeth II was moved from King Edward VII's Hospital, where he has been treated since Feb. 17, to St. Bartholomew's Hospital, which specializes in cardiac care. During England’s current coronavirus lockdown, Philip, also known as the Duke of Edinburgh, has been staying at Windsor Castle, west of London, with the queen. Philip was last hospitalized in December 2019, spending four nights in the King Edward VII's Hospital for what the palace said was planned treatment of a pre-existing condition.

Police officers and a doorman stand outside the King Edward VII Hospital in London, Friday, Feb. 19, 2021. Buckingham Palace said the husband of Queen Elizabeth II, 99-year-old Prince Philip was admitted to the private King Edward VII Hospital on Tuesday evening after feeling unwell. (AP Photo/Matt Dunham)LONDON – Britain's Prince Philip is expected to stay in a London hospital for several more days after being admitted earlier this week in what Buckingham Palace described as “a precautionary measure.”The 99-year-old husband of Queen Elizabeth II remained Friday in the private King Edward VII's Hospital, where he was admitted on Tuesday evening. Both the queen, 94, and Philip received a first dose of a vaccine against the coronavirus in early January. Philip last had a spell in a hospital when he spent four nights at the King Edward VII in December 2019, where he was treated for a “pre-existing condition” and discharged on Christmas Eve.