“As we have said, the doctor is acting very cautiously. The duke remains in a good mood,” the source said on Friday.
The precise reason for admission was not disclosed.
The 99-year-old man withdrew from public life in 2017 and was taken to the hospital several times in recent years. In December 2019, he received hospital treatment for a pre-existing illness.
According to a royal source, his last admission was not an emergency and the duke traveled to King Edward VII’s hospital by car and entered without assistance. The source added that the disease was not related to Covid-19.
The queen remained at Windsor Castle, west of London, the source said at the time.
Prince Philip and Queen Elizabeth received at least one dose of the Covid-19 vaccine.