景洪市肺吸虫病流行区20年后的变化

The Change of Paragonimiasis Status in Jinghong City in the Past 20 Years

目的了解景洪市肺吸虫病流行区20年后疫区疫情变化和溪蟹的自然感染情况。方法从原流行区采集溪蟹,鉴定种类,用研磨水洗沉淀法、生物体视显微镜检查囊蚴或脱囊蚴并计数。将本次检查结果与周本江等1989年报告的结果进行比较,获得该流行区的纵向变化结果,分析引起变化的主要原因。结果从原流行区共采集溪蟹474只,经鉴定全为景洪溪蟹;从溪蟹体内共检获95个囊蚴,经分类鉴定全部为小睾并殖吸虫囊蚴,并通过感染实验动物家猫获得成虫加以证实。溪蟹的自然感染率为10.8%,感染度平均为1.86。结论景洪市同一流行区20年后发生了明显的变化,无论是溪蟹的种类、肺吸虫的虫种、溪蟹的自然感染率、感染度均出现了明显的下降。引起这些变化的主要原因是居民的健康意识增强和环境因素的改变所致。

Objective To study the change of paragonimiasis status in the epidemic area of Jinghing city in the past 20 years. Method Crabs were collected from past epidemic district and identified. Crab samples were prepared by grinding and washing-precipitation method for the analysis of metacercaria or excysted metacercaria under stereomicroscope. The results were compared with the report published by Zhou Ben-jiang in 1989. Result 474 crabs were collected from past epidemic district. All are Potamon chinghungense. 95 metacercaria were detected. All are the metacercaria of Paragonimus microrchis specie, and they were confirmed by infecting experimental cat. Crab natural infection rate was 10.8%, with an average of infection degree of 1.86. Conclusion The diversity of Potamon and Paragonimus, their natural infection rate, and infection degree were decreased significantly in the same place after 20 years. The main reasons for causing these changes are the residents paying more attentions to their health and the environment.