Highly specific polyclonal and monoclonal antibody against NP has been generated and used as capture and detector antibody respectively. of CCHFV. Further the assay was comparatively evaluated with a commercial kit employing gamma irradiated CCHFV, revealing a sensitivity and specificity of 100%. This newly developed sandwich ELISA (sELISA) with high sensitivity and specificity could be used as an efficient method for the detection of CCHF virus in humans, ticks and culture supernatant. The assay will be useful as alternate tool for diagnosis of acute infection and is amenable for screening of large scale samples in resource limited settings. and order clone expressing CCHF NP of strain NIV112143 (GenBank Accession no. “type”:”entrez-nucleotide”,”attrs”:”text”:”JN572089″,”term_id”:”347014997″,”term_text”:”JN572089″JN572089) was revived and r-NP was purified as per Shrivastava et al.22. Briefly, cultured and harvested cells were suspended in lysis buffer (50?mM NaH2PO4, 300?mM NaCl, and 10?mM imidazole, pH 8.0) supplemented with phenylmethylsulfonylfluoride (PMSF), lysozyme, and protease inhibiting cocktail (Sigma-Aldrich, USA). The culture was incubated at 4?C CB5083 for 30?min and sonicated at 9 pulse on/off for 30?min. The sonicated culture was centrifuged at 10,000expressed r-NP following the same protocol. Evaluation of sELISA with CCHF virus Sandwich ELISA was evaluated with tenfold serial dilutions of gamma irradiated CCHF virus (10C1 to 10C5) in different matrices viz., culture supernatant, serum and tick lysate with standardized protocol. CCHF virus strain NIV1040505 (GenBank number “type”:”entrez-nucleotide-range”,”attrs”:”text”:”MH396640-MH396642″,”start_term”:”MH396640″,”end_term”:”MH396642″,”start_term_id”:”1595991307″,”end_term_id”:”1595991311″MH396640-MH396642) was used in this study. For CCHFV inactivation, Co-60 source (Gamma Chamber; GC 5000) was used. For complete inactivation of the CCHFV, gamma irradiation dose of 24?kGy has been used for 2?h. Before further use, inactivation of the virus stock was confirmed by two blind passages in Vero cells. CB5083 Serum and tick specimens referred to NIV during various CCHF outbreaks in India were utilized for the evaluation of the CB5083 assay. Quantitative real-time PCR (qRT-PCR) of CCHFV The same dilutions were tested with real time RT-PCR and the data was comparatively analyzed27. Taqman real time RT-PCR was performed using TaqMan fast disease one-step master blend in 20?l reaction combination (Thermo Fisher Scientific, USA) using ABI7500 Dx real time PCR system (Applied Biosystems, USA). The primer/probe arranged used for the real time RT-PCR focusing on S-gene of CCHFV were Forward Primer: 5-CAAAGAAACACGTGCCGCTT-3; Reverse Primer: 5-ATTCACCTCGATTTTGTTTTCCAT-3 and Probe: 5-ACGCCCACAGTGTTCTCTTGAGTGTTAGCA-3. PCR cycling conditions included 50?C for 30?min and at 95?C for 2?min followed by 45 two-step cycles at 95?C for 15?s and at 55?C for 60?s. Following cycling, the result was analyzed from your amplification storyline. Cross-reactivity analysis of sandwich ELISA Mix reactivity of the sELISA assay was analysed with tradition supernatants of Dengue disease serotypes [DENV-1, RR107 (“type”:”entrez-nucleotide”,”attrs”:”text”:”KF289072″,”term_id”:”632992677″,”term_text”:”KF289072″KF289072); DENV-2, GWL18 (“type”:”entrez-nucleotide”,”attrs”:”text”:”AY324614″,”term_id”:”32765508″,”term_text”:”AY324614″AY324614); DENV-3, ND143 (“type”:”entrez-nucleotide”,”attrs”:”text”:”FJ644564″,”term_id”:”256600129″,”term_text”:”FJ644564″FJ644564); DENV-4, ND 73 (“type”:”entrez-nucleotide”,”attrs”:”text”:”HM237348″,”term_id”:”326649783″,”term_text”:”HM237348″HM237348)], Kyasanur forest disease disease strain 12839 (“type”:”entrez-nucleotide”,”attrs”:”text”:”MG720080″,”term_id”:”1423619269″,”term_text”:”MG720080″MG720080) and Yellow fever disease 17D strain (“type”:”entrez-nucleotide”,”attrs”:”text”:”KF769015″,”term_id”:”564014614″,”term_text”:”KF769015″KF769015). Statistical analysis All the generated data was analyzed with Medcalc 2.0 software. Ethics statement All methods are reported in accordance with ARRIVE guidelines. All methods were performed in accordance with the relevant recommendations and regulations. For animal experiments, the study protocol for those experiments was authorized as protocol no. Viro-14/57/PKD from the Institutional Animal Ethics Committee Rabbit Polyclonal to IL17RA (IAEC) constituted from the Committee for the Purpose of Control and Supervision of Experiments on Animals (CPCSEA), Ministry of Environment and Forestry, Authorities of India (Regd. no. 37/GO/Rbi/S/99/CPCSEA). Supplementary Info Supplementary Info.(169K, docx) Acknowledgements Authors are thankful to Dr D. K. Dubey, Director, DRDE, Gwalior, Dr.Priya Abraham, CB5083 Director, NIV, Pune and Dr. D. T. Mourya, Former Director, NIV, Pune for his or her keen interest, constant support, and provision of necessary facilities for this study. This manuscript is definitely assigned DRDE accession no. DRDE/VIRO/24/2020. The 1st author would also like to say thanks to Department of Technology and technology (DST), Govt. of India for providing INSPIRE fellowship. Author contributions P.K.D. and N.S. conceived, designed the experiments. N.S. carried out the experiments, analysed data and published the MS. P.K.D. supervised the study, critically revised the MS for intellectual content material. J.S.K. and A.S. performed the antibody generation experiments and examined the manuscript. P.D.Y., A.M.S. and R.J..
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