title: Polymerase spiral reaction (PSR): a novel, visual isothermal amplification method for detection of canine parvovirus 2 genomic DNA.
abstract: Canine parvovirus-2 (CPV-2), which is ubiquitously distributed worldwide, causes severe and often fatal gastroenteritis in dogs. Accurate, differential and rapid diagnosis of canine parvoviral enteritis remains a challenge for clinicians. A recently developed isothermal amplification technique, polymerase spiral reaction (PSR), was optimized for the first time for a viral pathogen with reference recombinant plasmid standards from different CPV-2 antigenic variants (CPV-2, CPV-2a, CPV-2b and CPV-2c) and subsequently validated using clinical samples. Addition of chromogenic substrate SYBR Green I after the completion of the reaction resulted in bright green fluorescence in positive samples, while negative samples and a no-template control remained orange. These results were further substantiated through visualization of a laddering pattern of the PSR-amplified product in an agarose gel in positive cases and the absence of this pattern in no-template control and negative samples. The PSR assay was found to be highly specific, as it did not react with other putative canine pathogens (canine adenovirus 1 and canine distemper virus). The sensitivity of the newly developed PSR technique was compared with that of conventional PCR, real-time PCR and LAMP, using a serial tenfold dilution of canine parvovirus DNA. The detection limit of PSR was found to be at the femtogram level, which is comparable with that of real-time PCR and LAMP, which are ten times more sensitive than conventional PCR. The assay was validated using 90 clinical samples, of which 54 were found positive, while only 45 samples were positive in conventional PCR. This novel assay, which is fully compliant with the 'ASSURED' concept for disease diagnosis, provides a simple, rapid, specific, sensitive and cost-effective method for diagnosis of canine parvoviral enteritis in veterinary clinics.
authors.affiliation: Centre for Animal Disease Research and Diagnosis, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, UP, 243122, India. vet.gvikas@gmail.com.
authors.forename: Vikas
authors.initials: V
authors.lastname: Gupta
authors.affiliation: Division of Biological Products, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, UP, 243122, India.
authors.forename: Soumendu
authors.initials: S
authors.lastname: Chakravarti
authors.affiliation: Centre for Animal Disease Research and Diagnosis, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, UP, 243122, India.
authors.forename: Vishal
authors.initials: V
authors.lastname: Chander
authors.affiliation: Centre for Animal Disease Research and Diagnosis, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, UP, 243122, India.
authors.forename: Saurabh
authors.initials: S
authors.lastname: Majumder
authors.affiliation: Centre for Animal Disease Research and Diagnosis, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, UP, 243122, India.
authors.forename: Shabir Ahmad
authors.initials: SA
authors.lastname: Bhat
authors.affiliation: Centre for Animal Disease Research and Diagnosis, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, UP, 243122, India.
authors.forename: Vivek Kumar
authors.initials: VK
authors.lastname: Gupta
authors.affiliation: Centre for Animal Disease Research and Diagnosis, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, UP, 243122, India. sukdebnandi@yahoo.in.
authors.forename: Sukdeb
authors.initials: S
authors.lastname: Nandi
mesh_terms: D000818:Animals; D004279:DNA, Viral / Q000235:genetics*; D004285:Dogs; D016679:Genome, Viral / Q000235:genetics*; D021141:Nucleic Acid Amplification Techniques / Q000379:methods*; D017993:Parvovirus, Canine / Q000145:classification / Q000235:genetics*; D012680:Sensitivity and Specificity
chemical_list: D004279:DNA, Viral