This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated.By Elizabeth Cohen Senior Medical Correspondent (CNN) — Late one night on Facebook, a girl with cystic fibrosis messaged a boy with cystic fibrosis, and both their lives were changed forever. The girl, Katie Donovan, read that the boy, Dalton Prager, was very sick. “If you ever need a friend to talk to, you can reach out to me,” she wrote. “Sorry, but do I know you?” he responded. No, you don’t, Katie wrote back, and told Dalton a bit about herself. Like him, she was 18, and “my breathing is pretty crappy and I see you are in the hospital. I’m sorry. I know it sucks!…But you just gotta stay strong.” Messages between the two flew back and forth, and three days later, Katie and Dalton decided they wanted to meet in person. But there was a problem. They both knew that cystic fibrosis patients shouldn’t be near each other because they can share infections that could cripple their already fragile lungs. Dr. Michael Anstead at the University of Kentucky, Katie’s pulmonologist since she was a little girl, had lectured her many times that while social media connections were great, face-to-face meetings with other CF patients were a bad idea. Over the phone, Dalton shared with Katie that he had Burkholderia cepacia, a horribly dangerous infection for people with CF. “When we were deciding whether to meet up or not, I told Dalton I’d rather be happy — like really, really happy — for five years of my life and die sooner than be mediocre happy and live for twenty years,” Katie says. “That was definitely something I had to think about, but when you have those feelings, you just know.” Love won. Katie visited Dalton in the hospital, and two years later they were married. But Anstead’s fears were realized: just one month after meeting, Dalton had passed on his infection to Katie. A year after their wedding, both the Pragers had become too sick to work. Dalton quit his job at his family’s auto repair shop, and Katie quit hers as a store clerk. Two years later, in August, 2014, the couple entered University of Pittsburgh Medical Center together to wait for new lungs. Dalton’s came first, and on November 17, he had his transplant. Despite his Burkholderia cepacia, which makes transplants more complicated, it was a success. “I was so thrilled. I was so happy for him,” Katie says.