https://i.cbc.ca/ais/a6d7f2d5-8b7e-406d-9e4e-9e9685af706e,1783547134004/full/max/0/default.jpg?im=Crop%2Crect%3D%280%2C0%2C2016%2C1134%29%3BResize%3D%28620%29" title="This photomicrograph of a fresh stool sample, which had been prepared using a 10% formalin solution, and stained with safranin, revealed the presence of three uniformly stained Cyclospora cayetanensis oocysts in the field of view." width="620" />
A diarrhea-causing parasite has led to a growing outbreak in the United States that has sickened more than 1,000 people and sent dozens to hospital.