Which disease is NOT caused by protozoa?

Ringworm is not caused by protozoa but by fungi. It is a common skin infection characterized by a red, itchy rash that appears as circular patches with clear skin in the middle. Fungi thrive in warm, moist environments and can infect the outer layer of skin, hair, and nails.

In contrast, the other options, such as malaria, dysentery, and African sleeping sickness, are all diseases caused by protozoa. Malaria is caused by Plasmodium species, dysentery can be caused by Entamoeba histolytica, and African sleeping sickness is caused by the Trypanosoma brucei. Understanding the differences between these microorganisms is crucial in infection control and prevention strategies.