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A real-time loop-mediated isothermal amplification method for rapid detection of Lawsonia intracellularis in porcine fecal samples.
Journal of Microbiological Methods 2018 June 14
Porcine proliferative enteritis is a common diarrheal disease characterized by thickening of the intestinal mucosa in swine due to enterocyte proliferation, which is caused by Lawsonia intracellularis. In this study, a real-time loop-mediated isothermal amplification (LAMP) assay was developed to detect L. intracellularis based on the conserved region of the 16S ribosomal RNA gene. The optimal reaction conditions of the real-time LAMP was 65 °C for 60 min. The LAMP products could be detected by both real-time turbidity and direct visual inspection. The assay was specific for L. intracellularis, as no cross-reaction was observed with other pathogens. The detection limit of the real-time LAMP assay was 1.4 × 10-1 pg of L. intracellularis DNA, which was the same as that of real-time PCR and approximately 100 times more sensitive than that of conventional PCR. Of the 136 clinical samples, L. intracellularis DNA was identified in 60 samples by real-time LAMP, which was the same as real-time PCR and higher than conventional PCR (36.8%, 50/136). The specific, sensitive and rapid real-time LAMP assay developed in this study could be a useful alternative tool in point-of-care (POC) diagnosis of L. intracellularis infection.
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