Last September, Kevin Quinn was trekking through a remote, mountainous region in central Washington state when he started feeling sick. "At first, I thought it was just a stomachache," he says, "But when we got to the campsite I started throwing up, and it started coming out the other end as well."
He was hiking north on the Pacific Crest Trail — a five-month, 2600-mile trek from the Mexican border up to Canada that's gotten popular in the last 10 years thanks to the memoir Wild, by Cheryl Strayed, which became a movie in 2014.
