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Mahapatra CS, Sharma P, Biswas SK, Chand K. Development of ELISA for the detection of antibodies against VP2 protein of bluetongue virus serotype-1. J Immunol Methods 2022; 511:113386. [PMID: 36384199 DOI: 10.1016/j.jim.2022.113386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 09/23/2022] [Accepted: 11/10/2022] [Indexed: 11/14/2022]
Abstract
Serotype-specific diagnosis of bluetongue virus (BTV) is necessary for sero-surveillance and taking effective control measures. The VP2 is the major serotype determining protein and BTV-1 is the most predominant serotype in India. In the present study, an indirect ELISA (i-ELISA) was optimized for the detection of serotype-specific antibody against BTV-1 serotype. The VP2 protein of BTV-1 was expressed in a prokaryotic expression system and used to optimize i-ELISA to detect VP2 antibodies of BTV-1 in serum samples of both small and large ruminants. Serum samples (n = 363) classified as positive and negative for antibodies to BTV-1 by serum neutralization test (SNT) and also positive and negative for BTV antibodies by c-ELSIA kit (VMRD, USA) were used to determine the cut-off value, diagnostic sensitivity (DSn), and diagnostic specificity (D-Sp) using receiver operating characteristic (ROC) analysis. The percent positivity (PP) value >30.10% was accepted as the cut-off for i-ELISA at which DSn of 99.52% and D-Sp of 99.35% was observed with a 95% confidence interval. Further, there was no cross-reactivity with other available BTV serotypes in the country. The study indicated serotype-specific i-ELISA is sensitive, specific and suitable alternative to tedious SNT method for determining serotype. The assay will also help in the serotype-specific epidemiological studies and implementation of future control strategies including vaccination and selection of suitable serotype as a vaccine candidate.
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Affiliation(s)
- Chayna Singha Mahapatra
- Division of Virology, ICAR-Indian Veterinary Research Institute, Mukteswar Campus, 263138 Nainital, Uttarakhand, India
| | - Priya Sharma
- Division of Virology, ICAR-Indian Veterinary Research Institute, Mukteswar Campus, 263138 Nainital, Uttarakhand, India
| | - Sanchay Kumar Biswas
- Division of Virology, ICAR-Indian Veterinary Research Institute, Mukteswar Campus, 263138 Nainital, Uttarakhand, India
| | - Karam Chand
- Division of Virology, ICAR-Indian Veterinary Research Institute, Mukteswar Campus, 263138 Nainital, Uttarakhand, India.
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Mohanty NN, Hemadri D, Munivenkatarayappa A, Shetty N, Subramanyam V, Biswas SK, Chanda MM, Shivachandra SB. Development of recombinant NS1-NS3 antigen based indirect ELISA for detection of bluetongue antibodies in sheep. J Immunol Methods 2021; 490:112959. [PMID: 33412173 DOI: 10.1016/j.jim.2021.112959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Revised: 11/30/2020] [Accepted: 12/31/2020] [Indexed: 10/22/2022]
Abstract
Bluetongue is an insect borne (Culicoides) viral disease of small ruminants. The virus blankets the globe with a wide serotypic variation, numbered from 1 to 28. In India 21 different serotypes have been reported to be circulating across the various agro-climatic zones of the country. Non-structural proteins (NSPs) of bluetongue virus have always remained ideal target for differentiation of infected from vaccinated animals. The current study is an extrapolation of our previous work where a novel fusion construct comprising of bluetongue viral segment NS1 and NS3 was successfully cloned, expressed, purified with an efficient strategy for its suitable implementation as a diagnostic antigen. In this study, the applicability of the fusion construct has been further evaluated and optimised for field applicability. The fusion construct used in an ELISA platform projected a relative diagnostic sensitivity and specificity of 98.1% and 95.5% respectively against a pre-established test panel. The rNS1-NS3 ELISA showed substantially good agreement with the commercial BTV antibody detection kit. Finally, the study brings together the diagnostic capability of two NSPs, which can be a handy tool for sero-surveillance of bluetongue.
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Affiliation(s)
- Nihar Nalini Mohanty
- ICAR-National Institute of Veterinary Epidemiology and Disease Informatics (ICAR-NIVEDI), PB No. 6450, Yelahanka, Bengaluru 560 064, India
| | - Divakar Hemadri
- ICAR-National Institute of Veterinary Epidemiology and Disease Informatics (ICAR-NIVEDI), PB No. 6450, Yelahanka, Bengaluru 560 064, India.
| | - Archana Munivenkatarayappa
- ICAR-National Institute of Veterinary Epidemiology and Disease Informatics (ICAR-NIVEDI), PB No. 6450, Yelahanka, Bengaluru 560 064, India
| | - Namrata Shetty
- ICAR-National Institute of Veterinary Epidemiology and Disease Informatics (ICAR-NIVEDI), PB No. 6450, Yelahanka, Bengaluru 560 064, India
| | - Vinutha Subramanyam
- ICAR-National Institute of Veterinary Epidemiology and Disease Informatics (ICAR-NIVEDI), PB No. 6450, Yelahanka, Bengaluru 560 064, India
| | - Sanchay Kumar Biswas
- ICAR-Indian Veterinary Research Institute, Mukteswar-Kumaon, Nainital 243122, Uttarakhand, India
| | - Mohammed Mudassar Chanda
- ICAR-National Institute of Veterinary Epidemiology and Disease Informatics (ICAR-NIVEDI), PB No. 6450, Yelahanka, Bengaluru 560 064, India
| | - Sathish B Shivachandra
- ICAR-National Institute of Veterinary Epidemiology and Disease Informatics (ICAR-NIVEDI), PB No. 6450, Yelahanka, Bengaluru 560 064, India
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