A flagellate protozoan , such as a trypanosome , that is parasitic in the blood .
血鞭毛虫一种鞭毛原生动物，如锥体虫，寄生于血液之中。
To obtain genetic stable strain , we evaluated the clearance of symbionts in tsetse , impact of vitamin supplement on fly fertility and relationship between symbiont and trypanosome infection .
