Buckingham Palace has confirmed that Prince Philip is currently fighting an infection and will not leave hospital for several days.
The 99-year-old was taken ill last week and has remained in hospital care ever since, with Prince Charles visiting him over the weekend in a 200 mile round-trip.
However, a statement from the Palace has added that the Duke of Edinburgh is "comfortable and responding to treatment".
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Prince Philip was admitted to the King Edward VIII hospital in London on Tuesday, 16th February for a period of "rest and recuperation."
It was initially believed to be a precautionary measure, with the Prince being treated by a royal physician before being taken to hospital "out of an abundance of caution."
Both Philip, and Queen Elizabeth II, received the coronavirus jab in January to protect them both from the ongoing Covid-19 pandemic. They have been staying in their Windsor Castle residence throughout the ongoing lockdown period.
Royal aides have since confirmed that Philip's illness is not related to coronavirus.
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Prince William was asked about his grandfather's health earlier this week while he was visiting Kings Lynn Corn Exchange Vaccination Centre.
Giving a wink to waiting journalist, the Duke of Cambridge replied: "Yes, he's okay, they're keeping an eye on him."
Prince Philip retired from public life in August 2017 after several decades supporting the Queen on her duties as well as attending his own events and charity endeavours.
Well-wishers have 'every reason' to be optimistic about Philip, who remains in good health despite his old age, according to royal biographer Penny Junor who spoke on BBC Radio 4 last week.
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The Duke of Edinburgh has four children, eight grandchildren, and nine great-grandchildren. The most recent addition to the family was Princess Eugenie's little boy, born earlier this month, while Prince Harry is currently expecting his second child with Meghan Markle.
The Queen and her husband celebrated their 73rd wedding anniversary last year. He has previously been described by his wife as her "strength and stay".
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