1. The ciliated protozoan is a kind of unicellular eukaryotes. When the environment is detrimental to its vital movement, it will usually form a resting cyst through secreting special substance, and enter into the dormant condition.
    原生动物纤毛虫是一种单细胞真核生物，在环境不利于其生命活动时，往往会分泌特殊物质形成包囊并且转入休眠状态。

2. Fish acquire protectie immunity against the ciliated protozoan parasite Ichthyophthirius multifiliis following sublethal infection or inoculation with I. multifiliis immobilization antigens. In both cases, parasite-immobilizing antibodies hae been identified in sera and mucosal secretions.
    斑点叉尾鮰感染亚致死剂量的小瓜虫或接种小瓜虫抑动抗原（注射纯化的抑动抗原5μg/尾加弗氏不完全佐剂）后，获得了对小瓜虫的保护性免疫，而且在血清和粘膜分泌物中都检测到小瓜虫抑动抗体。