快速评价湖沼型地区血吸虫病感染率方法研究

STUDY ON THE METHOD OF RAPID EVALUATION OF PREVALENCE OF SCHISTOSOMIASIS IN MARSHLANDS AND LAKE REGIONS

目的探讨批质量保证性抽样（LQAS）方法在评价血吸虫感染方面的作用。方法应用回顾性研究方法，对湖南、江西、安徽等省1989年全国血吸虫病抽样数据，根据LQAS的原理，确定显著性水平和最佳特征值。在此基础上，对血吸虫病流行区进行纵向评价。结果将显著性水平定为0．05和特征值定为2时，根据LQAS所得的感染率水平与实际观察值较为一致，并据此对江西蓼南等6个不同程度的血吸虫病流行区进行纵向评价，发现此抽样方法在中、高度血吸虫病流行区具有较高的一致性。结论LQAS方法在评价血吸虫病感染率水平方面有着较广泛的应用前景。

Objective To evaluate the infection level of schistosomiasis using Lot Quality Assurance Sampling. Methods After analyzing the data of national sampling survey carried out in l989, LQAS was used to determine the critical values (d) and sample number based on the different a and β level. After that, prospective study was carried out in six endemic areas of schistosomiasis to compare the consistence of infection level using LQAS and the fields survey. Results The retrospective study indicated that it is comparable between the infection levels determined by LQAS and the data collected in 1989 when a=0.05 and d =2. Using this Q and d, the prospective study showed that there is consistence of infection levels determined by LQAS and fields survey. Conclusion LQAS can be used to evaluate the infection level especially in the high endemic areas of schistosomiasis.