Development of recombinant nucleocapsid protein-based indirect enzyme-linked immunosorbent assay for sero-survey of porcine reproductive and respiratory syndrome

Research (Published online: 05-12-2020)

2. Development of recombinant nucleocapsid protein-based indirect enzyme-linked immunosorbent assay for sero-survey of porcine reproductive and respiratory syndrome

S. Phani Kashyap, Jagadish Hiremath, S. Vinutha, Sharanagouda S. Patil, Kuralayanapalya P. Suresh, Parimal Roy and Divakar Hemadri

Veterinary World, 13(12): 2587-2595

S. Phani Kashyap: ICAR-National Institute of Veterinary Epidemiology and Disease Informatics, P.B. No. 6450, Yelahanka, Bengaluru, Karnataka, India; Department of Microbiology and Biotechnology, Jain University, Bengaluru, Karnataka, India.

Jagadish Hiremath: ICAR-National Institute of Veterinary Epidemiology and Disease Informatics, P.B. No. 6450, Yelahanka, Bengaluru, Karnataka, India.

S. Vinutha: ICAR-National Institute of Veterinary Epidemiology and Disease Informatics, P.B. No. 6450, Yelahanka, Bengaluru, Karnataka, India; Department of Microbiology and Biotechnology, Jain University, Bengaluru, Karnataka, India.

Sharanagouda S. Patil: ICAR-National Institute of Veterinary Epidemiology and Disease Informatics, P.B. No. 6450, Yelahanka, Bengaluru, Karnataka, India.

Kuralayanapalya P. Suresh: ICAR-National Institute of Veterinary Epidemiology and Disease Informatics, P.B. No. 6450, Yelahanka, Bengaluru, Karnataka, India.

Parimal Roy: ICAR-National Institute of Veterinary Epidemiology and Disease Informatics, P.B. No. 6450, Yelahanka, Bengaluru, Karnataka, India.

Divakar Hemadri: ICAR-National Institute of Veterinary Epidemiology and Disease Informatics, P.B. No. 6450, Yelahanka, Bengaluru, Karnataka, India.

doi: www.doi.org/10.14202/vetworld.2020.2587-2595

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Article history: Received: 29-06-2020, Accepted: 21-10-2020, Published online: 05-12-2020

Corresponding author: Divakar Hemadri

E-mail: divakar.hemadri@icar.gov.in

Citation: Phani Kashyap S, Hiremath J, Vinutha S, Patil SS, Suresh KP, Roy P, Hemadri D (2020) Development of recombinant nucleocapsid protein-based indirect enzyme-linked immunosorbent assay for sero-survey of porcine reproductive and respiratory syndrome, Veterinary World, 13(12): 2587-2595.

Abstract

Background and Aim: Porcine reproductive and respiratory syndrome (PRRS) is a disease endemic in many countries and is of economic importance. India was free from PRRS until the first outbreak was reported from a North-East Indian state in 2013. Since then, disease outbreaks have been reported from North-East India and the pilot study conducted earlier showed that it is gradually spreading to the rest of India. Considering there are no locally developed population screening tests available for PRRS and imported diagnostic/screening tests are expensive, the present study was aimed at developing recombinant nucleocapsid (rN) protein-based indirect enzyme-linked immunosorbent assay (iELISA).

Materials and Methods: The rN protein of PRRS virus (PRRSV) was produced following standard cloning, expression, and purification procedures. Using this antigen, iELISA was optimized for the detection of serum antibodies to PRRSV. The sensitivity and specificity of the test were assessed by comparing it with a commercial PRRSV antibody detection kit.

Results: A total of 745 serum samples from ten different states of India were screened using the developed iELISA. The iELISA had a relative specificity of 76.18% and sensitivity of 82.61% compared to the commercial ELISA (Priocheck PRRSV ELISA kit, Thermo Fisher Scientific, USA).

Conclusion: The iELISA, which deployed rN protein from Indian PRRSV, was found to be suitable in the serological survey and may be a useful tool in future disease surveillance programs.

Keywords: indirect enzyme-linked immunosorbent assay, nucleocapsid protein, porcine reproductive and respiratory syndrome, sensitivity, specificity.