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" ... Cryptosporidium is a single-celled organism, a protozoan. It causes diarrhea that often lasts for 2-3 weeks and is readily missed by the lab. It This is because often only a stool culture is ordered, and the parasites are instead seen on direct examination of stool through a microscope. Many community hospitals don’t have techs skilled in this and have resorted to sending stool samples “for ova and parasites” to a reference lab, causing further diagnostic delays. ... "