单核细胞增生李斯特氏菌实时荧光定量PCR快速检测方法的建立

为建立单核细胞增生李斯特菌(Listeria monocytogenes,LM)的快速检测方法,本研究以LM iap基因为靶基因设计合成引物及TaqMan探针,建立实时荧光定量PCR快速检测LM的方法。结果显示,对15株试验菌株进行实时荧光定量PCR检测,只有LM菌株检测为阳性,表明该检测方法特异性强;该方法的灵敏度为6.5 CFU/mL;稳定性和重复性试验结果表明,同一样品重复检测4次Ct值的变异系数均小于2%;利用该检测方法对采集的139份样品进行检测,共计检出3份LM阳性样品,与国标法(GB 478930-2010)检测结果一致。该检测方法灵敏度高、特异性强、重复性好,具有良好的实用性。

Development of A Dual Real-time PCR for the Rapid Detection of Listeria monocytogenes

To establish a rapid assay for Listeria monocytogenes(LM) detection,a Real-time PCR method was developed targeting iap gene of LM.The results showed that the test for 15 bacteria strains,only LM was positive,indicated that the method had high specificity.In addition,the sensitivity of Real-time PCR was 6.5 CFU/mL.Stability and reproducibility of the test showed that the coefficient of variation for the same sample repeat the Ct values were less than 2%.Furthermore,a total of 3 positive samples for LM were detected from 139 clinical samples by the method,which was in accordance with the testing result by GB 478930-2010 standard detection protocol.Therefore,the Real-time PCR method provides a novel rapid,sensitive and good repeatability detection method for LM infection.