原生动物中能使昆虫致病的主要有鞭毛虫类、纤毛虫类、变形虫类、球虫类、单孢子虫类和微孢子虫类等。我们从1974年饲养中华按蚊以来,曾多次发生过纤毛虫——钟虫对中华按蚊幼虫的危害。对此我们作了一些初步观察,现将结果报导如下。一、钟虫危害中华按蚊幼虫的情况为研制周期型马来丝虫——长爪沙鼠模型,实验室饲养了虫媒——中华按蚊。我们饲养中华按蚊幼虫的水为我院自来水场的水(该水引自天然水库),用前预先在养蚊室 Protozoan insects can make pathogenic mainly flagellates, ciliates, amoebae, coccidia, monospore and microsporidia and so on. Since the breeding of Anopheles sinensis in 1974, we have had many ciliates - the harm of clockworms to Anopheles sinensis larvae. We made some preliminary observations on this, the results reported below. First, the clockworms endanger the Anopheles sinensis larvae In order to develop a cycle-type Malayan worm - Mongolian gerbil model, the laboratory feeding insect vector - Anopheles sinensis. We are raising Anopheles sinensis larvae of water for our hospital water (water from the natural reservoir), pre-use mosquito room