Trypanosomiasis This is a protozoan disease of animals and humans caused by parasites of the genus Trypanosoma, which are found in blood plasma, various body tissues and fluids.iseases caused by protozoa. Dr.Kedar Karki M.V.St.Preventive Veterinary Medicine Philippines. Trypanosomiasis. • This is a protozoan disease of animals and humans caused by parasites of the genus Trypanosoma, which are found in blood plasma, various body tissues and fluids.