Development of a pan-serotype reverse transcription loop-mediated isothermal amplification assay for the detection of dengue virus

During dengue outbreaks, acute diagnosis at the patient's point of need followed by appropriate supportive therapy reduces morbidity and mortality. To facilitate needed diagnosis, we developed and optimized a reverse transcription loop-mediated isothermal amplification (RI-LAMP) assay that detects all 4 serotypes of dengue virus (DENV). We used a quencher to reduce nonspecific amplification. The assay does not require expensive thermocyclers, utilizing a simple water bath to maintain the reaction at 63 degrees C. Results can be visualized using UV fluorescence, handheld readers, or lateral flow immunochromatographic tests. We report a sensitivity of 86.3% (95% confidence interval [CI], 72.7-94.8%) and specificity of 93.0% (95% Cl. 83.0-98.1%) using a panel of clinical specimens characterized by DENV quantitative reverse transcription-polymerase chain reaction. This pan-serotype DENV RI-LAMP can be adapted to field-expedient formats where it can provide actionable diagnosis near the patient's point of need. (C) 2015 Elsevier Inc. All rights reserved.