国内偶见蓝氏贾第鞭毛虫调查的报告.结果多不一致。洛阳市流行情况至今未进行调查.我们于1989年9—11月对市辖偃师,宜阳、栾川三县13个调查点进行了调查,现将调查结果报告如下:调查对象及方法一、抽样方法与对象的确定根据我市经济情况、卫生条件、文化水平、地理地貌采用逐步分层整群随机抽样方法,选定了偃 Domestic occasional investigation of Giardia lamblia survey results are mostly inconsistent. The prevalence of Luoyang has not been investigated so far. From September to November 1989, we conducted a survey of 13 investigation points under the jurisdiction of Yanshi, Yiyang and Luanchuan counties in 1989. The survey results are reported as follows: , Sampling methods and objects to determine According to the city’s economic conditions, health conditions, cultural level, geographical and geographical use of gradual stratified cluster random sampling method, selected Yan