Nightingale Microbiology Practice Exam

Cryptosporidium is the parasite that causes cryptosporidiosis. It’s a tiny protozoan whose life cycle includes hardy oocysts that can survive in water and food, making waterborne and foodborne transmission common. In healthy individuals, infection often leads to watery diarrhea, abdominal cramps, and nausea that usually resolves, but it can be more severe and prolonged in immunocompromised people. Understanding what each organism typically causes helps connect the name to the disease: Giardia intestinalis leads to giardiasis with greasy, malabsorptive stools; Entamoeba histolytica causes amoebic dysentery and can form liver abscesses; Plasmodium falciparum is the agent of malaria with fever cycles and red blood cell invasion. Cryptosporidium specifically points to cryptosporidiosis, matching the clinical picture of watery diarrhea and the parasite’s distinctive oocyst form.