Over 200,000 people have been affected by the disease worldwide.
Elsewhere, Dolly recently paid tribute to her fellow country singer and friend Kenny Rogers, who died aged 81.
The hitmaker, who sang Islands in the Stream with Dolly, “passed away peacefully at home from natural causes under the care of hospice and surrounded by his family,” his representative said in a statement.
Dolly said of the late singer: “You never know how much you love somebody until they’re gone.
“I’ve had so many wonderful years and wonderful times with my friend Kenny, but above all the music and the success I loved him as a wonderful man and a true friend.”