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为落实《全国中小学生肠道蠕虫防治方案》，我们于1993年6月对县城1所中学、2所小学进行了人群寄生虫感染情况调查。1对象与方法调查对象为本县3所中小学学生1146名，其中中学生427名，小学生719名。方法采用（1）碘液直接涂片法，查肠道原虫包囊；（2）改良加藤氏厚涂片法，查
In order to implement the “National Prevention and Cure Program of Intestinal Worm for Primary and Secondary School Students,” we conducted a survey on the population-based parasite infection in 1 secondary and 2 primary schools in the county in June 1993. 1 Subjects and Methods The surveyed subjects were 1146 primary and secondary school students in this county, including 427 middle school students and 719 primary school students. Methods (1) iodine direct smear method, check intestinal protozoa cysts; (2) modified Kato thick smear method, check