Sleeping sickness is a parasitic disease of humans and other animals.

Sleeping sickness is a parasitic disease of humans and other animals. It is caused by

Histomonas
Trypanosoma
Angomonac
Naegleria
This question was previously asked in
UPSC NDA-1 – 2017
Sleeping sickness, or African trypanosomiasis, is a parasitic disease caused by flagellate protozoa of the genus Trypanosoma. Specifically, Trypanosoma brucei gambiense and Trypanosoma brucei rhodesiense cause the disease in humans. The parasite is transmitted through the bite of an infected tsetse fly.
Sleeping sickness is caused by parasites of the genus Trypanosoma.
Histomonas meleagridis is a parasite that causes histomoniasis (“blackhead”) in poultry. Naegleria fowleri is a free-living amoeba that can cause a rare and fatal brain infection in humans. Angomonac is not a recognized parasitic genus.