弓形虫是一种感染人和多种脊椎动物 (包括哺乳动物和鸟类 )的寄生原虫 ,广泛分布于世界各地。人体的感染是由于食入受弓形虫卵囊污染的蔬菜、水果等 ,或是吃了含有包囊的生的或未熟的猪肉、牛肉或鸡肉等。由输血或器官移植也会发生传染[1] 。弓形虫进入人体后 ,在免疫功能正常 Toxoplasma gondii is a parasitic protozoan that infect humans and many vertebrates, including mammals and birds, and is widely distributed throughout the world. Human infections are caused by the ingestion of vegetables, fruits, etc., contaminated with toxoplasmosis oocysts, or eating raw or undergrown pork, beef or chicken containing cysts. Infection can also occur from transfusions or organ transplants [1]. Toxoplasma enter the body, the immune function is normal