I heard of several trips having tolio.I would encourage you to get a prescription from your doctor for Fluconazole to take in your medical kit. Last year on a Grand Canyon trip seven out of sixteen of us got Tolio and mine was by far the worst case. Tolio is a trench foot-like foot fungus. It started on day 6 and I could barely walk for the remainder of the trip. This year I took a prescription of Fluconazole with me on my Grand Canyon trip and on day 12 when the symptoms started, I took a 150 mg tablet and it started improving the next day and cleared up. As a side note, I put on anti-fungal cream every night on both trips beginning on day one.
Considering the 7 out of 16 people who got infected, was there a common denominator? For example, can you please tell me what type of shoes you wore? What month of the year was it? Etc.