目的 探索倍比稀释虎红平板凝集试验(RBPT)作为布鲁氏菌病(布病)诊断实验的可能性。方法 选择2013年内蒙古自治区布病患者血清93份,同时进行试管凝集试验(SAT)和倍比稀释RBPT检测,根据二者实验结果的相关性,以SAT结果作为判定标准,分析不同稀释倍数的RBPT作为诊断截断值的灵敏度和特异度来评价诊断的准确性。结果 倍比稀释RBPT受试者工作特征曲线下面积为0.946,以1∶2为截断值时约登指数最高为0.893,灵敏度为89.30%,特异度为100%;以1∶4作为截断值,RBPT的灵敏度为63.10%,约登指数为0.631,特异度为100%;以1∶8作为截断值,RBPT的灵敏度为57.14%,约登指数为0.571,特异度为100%;以1∶16作为截断值,RBPT的灵敏度为19.05%,约登指数为0.191,特异度为100%。结论 倍比稀释RBPT以1∶2为截断值时诊断的准确性最高,可以为布病诊断提供参考。

Objective To explore the feasibility of dilution rose bengal plate agglutination test (RBPT) for the diagnosis of brucellosis.Methods Serum samples from 93 brucellosis patients who came from Inner Mongolia, China in 2013 were tested by both dilution RBPT and standard tube agglutination test (SAT). According to the correlation between the results of the two tests and using the results of SAT as criteria, the sensitivity and specificity of RBPT were analyzed at different dilutions as cut-off values to evaluate the diagnostic accuracy.Results The area under the receiver operating characteristic curve for dilution RBPT was 0.946. When taking1∶2 as the cut-off value, the Youden index was 0.893, the sensitivity was 89.30% , and the specificity was 100%; when taking1∶4 as the cut-off value, the Youden index was 0.631, the sensitivity was 63.10%, and the specificity was 100%; when taking1∶8 as the cut-off value, the Youden index was 0.571, the sensitivity was 57.14%, and the specificity was 100%; when taking1∶16 as the cut-off value, the Youden index was 0.191, the sensitivity was 19.05%, and the specificity was 100%.Conclusion Dilution RBPT has the highest diagnostic accuracy at a dilution of1∶2, which provides a reference for the diagnosis of brucellosis.