The single-cell parasite Cryptosporidium is a leading cause of deadly diarrheal disease in young children, and a recent outbreak in the United Kingdom highlights how vulnerable the water supply is to this pathogen. The single-cell parasite Cryptosporidium is a leading cause of deadly diarrheal disease in young children, and a recent outbreak in the United Kingdom highlights how vulnerable the water supply is to this pathogen. Cell & Microbiology Molecular & Computational biology Phys.org – latest science and technology news stories