环介导等温扩增在检测肺炎支原体中的临床应用

目的 探讨一步法可视化环介导等温扩增(LAMP)在检测肺炎支原体中的临床应用价值。方法 用一步法可视化LAMP、聚合酶链反应(PCR)和酶联免疫吸附实验(ELISA)同时检测108份儿童支原体肺炎临床标本。 随机选取临床儿科住院患儿108例标本,包括以PCR法诊断肺炎支原体感染患儿73例和临床排除支原体肺炎的其他慢、急性呼吸道感染者35例,于入院的第1天分别采用LAMP、PCR和ELISA法检测同一患者咽拭子标本和血清标本,并分别计算Kappa统计量,评价LAMP 法与PCR法、LAMP 法与ELISA法的一致性。入院第5天重新采集40例患者的样本,用3种方法比较入院第1和5天的检测结果。结果 一步法可视化LAMP方法的敏感度为100%,特异度为94.3%;ELISA法的敏感度为65.8%,特异度为82.9%。一步法可视化LAMP方法与PCR法的Kappa值为0.956;与ELISA法比较,Kappa值为0.38。一步法可视化LAMP方法在第1天就检出阳性的标本例数比ELISA法高。结论 一步法可视化LAMP技术有高敏感度和特异度,在感染早期就可以检测出肺炎支原体。LAMP法与PCR法具有可比性,可用于肺炎支原体的检测。

Clinical Application of Loop-mediated Isothermal Amplification in Detection of Mycoplasma Pneumoniae

Objective To explore the clinical value of one-step visualization loop-mediated isothermal amplification(LAMP)in the detection of Mycoplasma pneumoniae(Mp).Methods One-step visualized LAMP,polymerase chain reaction(PCR),and enzyme-linked immunosorbent assay(ELISA)were used to simultaneously detect 108 clinical Mp specimens in children,which included 73 cases of Mp infection diagnosed by PCR and 35 cases of other chronic/acute respiratory tract infections.On the first day of admission,one-step visualization LAMP,PCR(fluorimetric method),and ELISA were used to test the throat swab and serum sample obtained from the same patient,and the Kappa value was calculated.The consistence between LAMP and PCR and that between LAMP and ELISA were compared.On the fifth day of admission,40 patients were resampled and the findings of these three tests on the first day and on the fifth day were compared.Results One-step visualization LAMP had a sensitivity of 100% and a specificity of 94.3%,whereas ELISA had a sensitivity of 65.8% and a specificity of 82.9%.The ratio of Kappa camparing one-step visualization LAMP and PCR was 0.956 and the ratio of Kappa camparing one-step visualization LAMP and ELISA was 0.38.The number of positive specimens detected by LAMP was higher than that by ELISA on the first day.Conclusions One-step visualization LAMP has excellent sensitivity and specificity in detecting early acute Mp infection.It has high consistency with PCR and can be applied to detect Mp.