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目的了解粪中日本血吸虫卵计量变异特征。方法对清溪二村民连续7次收集粪便，用改良Kato法涂片2张;对44倒粪检阳性者，再涂片10张。结果一村粪检累计检出率从单次42.38％增加到7次的68.26％，二村从17.02增加到35.98％。虫卵在同一粪便中的分布并非完全随机。结论改良Kato法的敏感性与人群感染度及粪便取样部位有关;个体内虫卵计量变异，可用负二项分布来描述其特征。
Objective To understand the quantitative characteristics of eggs in Schistosoma japonicum. Methods Two villagers in Qingxi were collected for stool for seven consecutive times and smeared with modified Kato method. Two swabs were smear positive for 44 inverted fecal samples and 10 smears were smeared again. Results The accumulative detection rate of fecal examination in one village increased from 42.38% to 68.26% of seven times and that of Erzhong increased from 17.02 to 35.98%. The distribution of eggs in the same stool is not completely random. Conclusions The sensitivity of modified Kato method is related to the infection rate of the human population and the sampling site of stool samples. The variation of egg mass in individuals can be described by the negative binomial distribution.