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目的探讨IHA筛查结果作为血吸虫病疫情判定指标应用价值。方法收集安徽省自2007年以来19个县(市、区)的疫情控制达标考核资料、32个县(市、区)的传播控制达标考核资料以及9个县(市、区)的传播阻断达标考核资料,分析疫情控制地区IHA筛查阳性率与人群感染率之间相关性、比较不同疫情状况地区人群IHA阳性率差别及不同疫情状况地区IHA阳性率95%置信区间。结果疫情控制地区IHA筛查阳性率与人群感染率之间存在正相关(rs=0.687,P=0.001);疫情控制、传播控制和传播阻断3个不同疫情状况地区IHA检查结果差别具有统计学意义(χ~2=3 373.28,P=0.000);以1∶10为IHA阳性阈值,人群IHA阳性率95%置信区间疫情控制地区为9.48%~9.94%,传播控制地区为2.71%~3.03%,传播阻断地区为0.78%~1.02%。结论随着疫情逐步下降,人群IHA阳性率也随之逐步下降,IHA检查结果在一定程度上可以反映群体疫情状况。
Objective To investigate the value of IHA screening as an index to determine the epidemic situation of schistosomiasis. Methods The data of epidemic control in 19 counties (cities and districts) in Anhui Province since 2007 were collected, and the information on the dissemination control of 32 counties (cities and districts) and the communication block in 9 counties (cities and districts) were collected According to the assessment data, the correlation between IHA screening positive rate and population infection rate was analyzed. The IHA positive rate in different epidemic areas was compared and the IHA positive rate was 95% confidence interval in different epidemic areas. Results There was a positive correlation between the prevalence of IHA screening and the population infection rate in the epidemic-controlled areas (rs = 0.687, P = 0.001). There were statistically significant differences in IHA test results between the three epidemic control areas (Χ ~ 2 = 3 373.28, P = 0.000). When the IHA positive threshold was 1:10, the IHA positive rate of 95% confidence interval in the population was 9.48% -9.94% in the control area and 2.71% -3.03% in the area of transmission control , Transmission block area is 0.78% ~ 1.02%. Conclusion With the gradual decline of the epidemic, the positive rate of IHA in the population also decreases gradually. The IHA test results can reflect the epidemic situation of the population to a certain extent.