“The Duke of Edinburgh remains in King Edward VII Hospital where he is receiving medical treatment for an infection. He is comfortable and responding to treatment but is not expected to be discharged from hospital for several days,” said the palace in a statement.
Prince Philip was taken to hospital last Tuesday after “feeling unwell”, Buckingham Palace said.
On Monday, his grandson Prince William said the 99-year-old was “OK” and hospital staff “were keeping an eye on him”.
Prince William made the remarks during a visit to a vaccination center in Norfolk, England on Monday.
Prince Philip, who turns 100 in June, retired from public life in 2017 and has been taken to hospital several times in recent years. In December 2019, he was hospitalized for a pre-existing illness.
His last admission was not an emergency, according to a royal source, who said he drove to King Edward VII Hospital and entered unaided. The source added that the illness was unrelated to Covid-19.
Prince Philip and Queen Elizabeth have both received at least one dose of a Covid-19 vaccine.
The couple have spent most of the past year at Windsor Castle, having left Buckingham Palace during the first wave of the Covid-19 pandemic in the spring of 2020.