刚地弓形虫(Toxoplasma gondii)的速殖子在人体急性感染期对致病有重要意义。国内对弓形虫的超微结构报道较少。为适应当前对弓形虫研究的需要,我们对速殖子超微结构进行了深入观察。 弓形虫速殖子呈半月形或香蕉形,前端较尖,后端钝圆,一边较扁平,一边较弯曲,大小约5～6×1.8～2.5μm,虫体外有细胞膜包绕。虫体前端有极环和类锥体,极环由内膜的前端增厚形成,厚约58.8～ Tachyzoites of Toxoplasma gondii are of great importance to pathogenicity during the acute phase of human infection. Toxoplasma domestic ultrastructural reports less. To meet the current needs of Toxoplasma research, we conducted an in-depth observation of ultrastructure of tachyzoites. Toxoplasma tachyzoites were semilunar or banana-shaped, the tip more pointed, the back-end blunt round, while the side is relatively flat, while more curved, the size of about 5 ~ 6 × 1.8 ~ 2.5μm, parasitic membrane surrounded by cells. Polar parasites front end and cone-like, polar ring by the thickening of the anterior end of the intima formed, about 58.8 ~