Prince Philip transferred to different hospital for further treatment.
Buckingham Palace said the Duke would receive tests for a pre-existing heart condition as well as receive treatment for an infection.
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‘Didn’t hurt at all’: Queen Elizabeth says COVID-19 vaccine was quick and painless.
"And the jab – it didn’t hurt at all," Queen Elizabeth said in remarks released by Buckingham Palace.
Prince Philip’s ‘precautionary’ stay in hospital continues for 7th night.
Prince William, son of heir Prince Charles, said on Monday his grandfather was "OK, they're keeping an eye on him."
Prince Philip doing ‘OK’ in hospital, says grandson Prince William.
A royal source said doctors had been acting out of an abundance of caution and that Philip was in good spirits.
Prince Charles visits father Prince Philip after 4th night in hospital.
Charles arrived at the back of the London hospital where Philip, the 99-year-old husband of Queen Elizabeth, has spent four nights.
Prince Harry and Meghan Markle confirm they will not return to royal roles.
Harry and Meghan, who announced they are expecting their second child on Sunday, shocked senior royals last year by announcing plans to step back from their royal roles.
Prince Philip spends 3rd night in London hospital
There were no reports of visitors arriving at the private hospital on Thursday.
Prince Philip spends 2nd night in hospital after ‘feeling unwell’.
A royal source stressed that the admission was not an emergency.
Prince Philip admitted to hospital ‘after feeling unwell’.
The Duke of Edinburgh was taken to hospital on Tuesday, Buckingham Palace said.
Queen Elizabeth, Prince Philip receive coronavirus vaccine, palace says.
Queen Elizabeth is 94-years-old, while Prince Philip is 99.
Queen Elizabeth II to deliver annual Christmas message — and a deepfake one.
Viewers may not be able to tell the difference between the real queen and the fake one.
Prince William kept positive COVID-19 diagnosis secret in April: reports.
Prince William kept his diagnosis secret and continued to work in self-isolation, according to reports.
U.K.’s Sophie, Countess of Wessex, self-isolating after coronavirus contact
The royal, 55, has no symptoms but is following government guidelines, a palace spokesman said