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Captain Tom Moore was unable to receive the Covid vaccine before he caught the virus because he was taking pneumonia medication.
The war hero is currently being treated in hospital for the deadly disease, his daughter Hannah revealed earlier today.
And while the 100-year-old would certainly have been among the very first to get the long-awaited jab, circumstances meant this wasn't the case.
A spokesperson for Captain Tom's family said: "Because of the medication he was taking for his pneumonia he couldn't have the Covid jab.
"But other than that, the information that was in his daughter Hannah's statement is all we can share at the moment.
"Everyone is sending positive thoughts his way."
Sharing news of his treatment, Hannah wrote on Twitter that her father was struggling to breathe.
She said: "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."
Since news of his condition was announced, people have shared messages of support.
Piers Morgan said: "Come on, Captain Sir Tom - we're all rooting for you."
Labour MP Rosens Allin-Khan wrote: "Sending all our best wishes to Captain Tom Moore and fingers crossed for a speedy recovery!"
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.
Featured Image Credit: PA
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