Current Research in Social Psychology (CRISP) is a peer reviewed, electronic journal publishing theoretically driven, empirical research in major areas of social psychology.
1 Leishmaniasis, caused by the leishmania genus of protists, and transmitted by the African sand fly;  Toxoplasmosis, caused by Toxoplasma gondii, and transmitted from contaminated animal meat or contaminated feces of infected animals;
So, those were some common as well as not-so-common human diseases that protists cause. Most of these protists are transmitted through such an insect vector, that has frequent and regular interactions with particular geographical sections of human populations for feeding purposes.he parasite invades the small intestine, and the common symptoms are watery stool, flatulence, and accumulation of foul-smelling stomach gas, vomiting, abdominal cramps, and foul breath. Some other noteworthy but comparatively uncommon diseases caused by protists would include:-.