Detection of enterovirus 71 using reverse transcription loop-mediated isothermal amplification (RT-LAMP)

Reverse transcription loop-mediated isothermal amplification (RI-LAMP), which is a visual assay for nucleic acids, is performed in a single step using one tube at 65 degrees C for 1.5h. In this study, RI-LAMP was established as a method for the detection of enterovirus 71 (EV71). The detection limit of the assay was approximately 10 copies, and no cross-reactivity was noted with Coxsackievirus A16, echovirus, human rotavirus (HRV) or norovirus. This assay, which offers greater sensitivity at a lower cost compared with the conventional reverse transcription polymerase chain reaction (RT-PCR), was validated using 252 clinical specimens that had been confirmed by laboratory diagnosis using RT-PCR. Both methods produced the same results with 52 positive samples. The RT-LAMP-based assay does not require specialised equipment, and therefore, it can be performed conveniently during an outbreak or under field conditions. In brief, the RI-LAMP-based assay provided a simple, rapid and efficient method for the detection of EV71 nucleic acid under field conditions. (C) 2011 Elsevier B.V. All rights reserved.