A patient comes into a hospital suffering from nausea, vomiting, muscle cramps, and explosive diarrhea. He says he was backpacking with friends about 10 days ago in an extreme wilderness area. They did not eat anything unusual, did not receive any insect bites, and only drank water from a jug filled from a cold, clear mountain stream. He had no noticeable symptoms until today. Preliminary tests reveal no bacterial or viral infection but do indicate the presence of a motile eukaryotic organism and round cystlike structures. Ruling out a bacterial or viral pathogen, based on the details given, discuss the most probable cause(s) of the patient’s condition. Discuss what precautions can be taken to prevent this disease and how it is treated.