Dozens of Hikers Became Ill During Trips to Waterfalls Near Grand Canyon

Dozens of hikers say they fell ill during trips to a popular Arizona tourist destination that features towering blue-green waterfalls deep in a gorge neighboring Grand Canyon National Park. Madelyn Melchiors, a 32-year-old veterinarian from Kingman, Arizona, said she was vomiting severely Monday evening and had a fever that endured for days after camping on the Havasupai reservation. She eventually hiked out to her car in a weakened state through stiflingly hot weather and was thankful a mule transported her pack several miles up a winding trail, she said. “I said, ‘If someone can just pack out my 30-pound pack, I think I can just limp along,’” said Ms. Melchiors, an experienced and regular backpacker. Afterward, “I slept 16 hours and drank a bunch of electrolytes. I’m still not normal, but I will be OK. I’m grateful for that.”...