Kate Garraway has revealed she and husband Derek Draper flew to Mexico in November and will return to the country next month.
Derek, a former political adviser, became seriously ill after contracting Covid-19 in March 2020.
The 54-year-old is now free of the virus but has suffered long-lasting damage to his organs and requires care at home.
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Speaking on ITV's Good Morning Britain, Kate revealed that, as a result of a documentary that aired last year, she was contacted by a doctor in the US who offered to help Draper with a new treatment he has been developing.
Kate said: "It's all come about actually because of the first documentary, so this is a doctor who works in the US and he's been working for 13 years on clinical trials of this treatment in the US and he is just at the point of waiting for approval on it.
"When he saw the documentary, he had already started helping people with the impact of covid. And he saw it and saw Derek and said 'I can help this man'."
Garraway and Draper flew out to Monterrey, Mexico, in November 2021 in order for Draper to begin the trial.
The couple will be returning for another 28-day stay next month, during which doctors will continue to monitor his brain, liver and lung function.
Speaking to Lorraine Kelly later on Tuesday morning, Kate said the British care system is "flawed" and "seriously underfunded".
She said: "There are lots of different treatments out there. This one, I'd researched confidently enough to know it wasn't going to do any harm, which is always my first criteria.
"There was no risk for anything negative, and the potential is extraordinary."
A follow-up documentary, Kate Garraway: Caring For Derek, airs tonight (February 22) at 9pm on ITV and the ITV Hub
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