title: Development and evaluation of a one step reverse transcription-loop mediated isothermal amplification assay (RT-LAMP) for rapid detection of foot and mouth disease virus in India.
abstract: A simple, rapid and sensitive diagnostic assay for Foot-and-mouth disease (FMD) is required for deployment in the field. In this study, development of Reverse Transcription-Loop Mediated Isothermal Amplification (RT-LAMP) assay based on the 3D polymerase gene for specific and rapid detection FMD virus (FMDV) was carried out. The assay was optimised with viral RNA extracted from serotype O, A and Asia 1 FMDV vaccine strains, which resulted a reliable amplification at 65 °C for 60 min. The amplified RT-LAMP products were identified by agarose gel electrophoresis with ethidium bromide staining or observation by naked eye for the presence of turbidity and colour change following the addition of hydroxyl naphthol blue (HNB). The specificity of the assay was demonstrated by the absence of amplification of genome extracted from other viruses or cellular origin. With respect to analytical sensitivity the developed RT-LAMP assay was found more sensitive than routinely used multiplex PCR (mPCR). Further, the assay was evaluated with RNA extracted from cell cultured isolates (n = 50), tongue epithelial samples (n = 150) and semen samples from infected bulls (n = 13). In conclusion, RT-LAMP with HNB dye was shown to be simple, specific and sensitive assay for rapid diagnosis of FMDV infection. Further, the assay has the potential for field deployment and use for rapid FMDV surveillance in India.
authors: Project Directorate on Foot-and-Mouth Disease, Indian Veterinary Research Institute Campus, Mukteswar, Nainital, 263 138 Uttarakhand India.
authors: Rajeev
authors: R
authors: Ranjan
authors: Project Directorate on Foot-and-Mouth Disease, Indian Veterinary Research Institute Campus, Mukteswar, Nainital, 263 138 Uttarakhand India.
authors: Muniswamy
authors: M
authors: Kangayan
authors: Project Directorate on Foot-and-Mouth Disease, Indian Veterinary Research Institute Campus, Mukteswar, Nainital, 263 138 Uttarakhand India.
authors: Saravanan
authors: S
authors: Subramaniam
authors: Project Directorate on Foot-and-Mouth Disease, Indian Veterinary Research Institute Campus, Mukteswar, Nainital, 263 138 Uttarakhand India.
authors: Jajati K
authors: JK
authors: Mohapatra
authors: Project Directorate on Foot-and-Mouth Disease, Indian Veterinary Research Institute Campus, Mukteswar, Nainital, 263 138 Uttarakhand India.
authors: Jitendra K
authors: JK
authors: Biswal
authors: Project Directorate on Foot-and-Mouth Disease, Indian Veterinary Research Institute Campus, Mukteswar, Nainital, 263 138 Uttarakhand India.
authors: Gaurav K
authors: GK
authors: Sharma
authors: Project Directorate on Foot-and-Mouth Disease, Indian Veterinary Research Institute Campus, Mukteswar, Nainital, 263 138 Uttarakhand India.
authors: Aniket
authors: A
authors: Sanyal
authors: Project Directorate on Foot-and-Mouth Disease, Indian Veterinary Research Institute Campus, Mukteswar, Nainital, 263 138 Uttarakhand India.
authors: Bramhadev
authors: B
authors: Pattnaik
keywords: Diagnosis; FMD virus; Foot and mouth disease; Loop mediated isothermal amplification assay; mPCR