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Captain Tom Moore has been admitted to hospital, where he is being treated for Covid-19 and pneumonia.
The 100-year-old's daughter Hannah said on Twitter that he was struggling to breathe.
The post reads: "I wanted to update everybody that today (Sunday 31st January) my father was admitted to hospital.
"Over the last few weeks he was being treated for pneumonia and last week tested positive for Covid-19.
"He was at home with us until today when he needed additional help with his breathing. He is being treated in a ward, although he is not in ICU.
"The medical care he has received in the last few weeks has been remarkable and we know that the wonderful staff at Bedford Hospital will do all they can to make him comfortable and hopefully return home as soon as possible.
"We understand that everyone will be wishing him well. We are of course focusing on my father and will update you when we are able to."
Captain Tom was knighted last summer after he helped to raise £33 million ($41m) for the NHS at the start of the coronavirus pandemic by completing 100 laps of his back garden in Bedfordshire - capturing the nation's hearts in the process.
Captain Tom, who is originally from Keighley in West Yorkshire, was also promoted to honorary Colonel when he turned 100 in April, with Prime Minister Boris Johnson recommending to the Queen that he received a knighthood for his charitable endeavours.
After being appointed in his new role, the legend even became involved in youth work, helping the Army Foundation College in Harrogate, a programme that helps train 16 and 17-year-olds.
To mark his century, he was honoured with a flypast from the Battle of Britain Memorial Flight.
The British public also helped celebrate by sending in thousands upon thousands of birthday cards.
More than 125,000 birthday cards were sent for Moore, who also became the oldest person to achieve a UK number one single with a version of 'You'll Never Walk Alone', performed alongside Michael Ball.
Tom, who became a national treasure almost overnight, had an original goal of £1,000, as a way of saying thank you to the NHS for all the help he's received over the years. But he soon smashed his target and then some.
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