Prince Philip's week-long hospital stay has been due to an infection, Buckingham Palace said today.

The 99-year-old Duke is spending his eighth day at King Edward VII's Hospital in London, where "he is receiving medical attention for an infection," a Palace spokesperson confirmed on Tuesday. "He is comfortable and responding to treatment but is not expected to leave hospital for several days," they added.

Prince Philip update: Health issue is "an infection"

While The Duke of Edinburgh's hospital admission has been a concern, all updates have been promising up to this time. Today, Prince Edward, the youngest child of Prince Philip and The Queen, also told Sky News: "He's a lot better and he's looking forward to getting out, which is the most positive thing. So we keep our fingers crossed."

Royals are monitoring Prince Philip amid hospital stay

The Palace first labelled Philip's admission to hospital last week as a "precautionary measure" as he was feeling "unwell." Over the weekend, Prince Charles visited his father, and, on Monday, Prince William said that "he's ok, they're keeping an eye on him."

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Prince Philip, 99, is in hospital receiving treatment for an infection.

The Duke of Edinburgh had been in lockdown at Windsor Castle with The Queen when he was admitted to hospital on Feb. 16. His 100th birthday falls on June 10 of this year.

Ian McKellen and Elijah Wood in 'The Fellowship of the Ring'.

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