A stomach-churning parasite that causes explosive, watery diarrhea has sickened over 140 people across multiple states — with the highest number of cases in New York. According to the CDC, 145 people ranging in age from 5 to 86 years and from 20 states contracted the parasite Cyclospora cayetanensis between May and June 16, with 20 hospitalized. Fortunately, there have not yet been any deaths.