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Video report by ITV News Correspondent Faye Barker
Images of the 90-year-old wearing the Christmas penguin top as she received the Pfizer/BioNTech jab at the University Hospital Coventry on Tuesday were beamed around the world - and in response global demand for Ms Keenan s T-shirt generated almost as much excitement as the momentous scientific breakthrough itself.
Ms Keenan s festive T-shirt - which she was given to wear so she would not be photographed in her pyjamas - is sold in support of the hospital s own charity.
Since the T-shirt s time in front of the cameras, the charity says it have seen sales soar by 300%, with orders flooding in from around the globe.