Protozoans. Protozoans include a wide diversity of taxa that do not form a monophyletic group but all are unicellular eukaryotes. Protozoa lack a cell wall, have at least one motile stage in their life cycle and most ingest their food.
in various taxa
Plasmodium in red blood cell
in West Africans (and African Americans of West African ancestry).
sickle shaped as a result of a mutation which causes hemoglobin chains to stick together.
Trypanosoma forms in blood smear from patient with African trypanosomiasis