Peer-reviewed veterinary case report
How to test for foot-and-mouth disease in pets?
By Mahajan, Sonalika et al.·Published in Journal of virological methods·2013·Project Directorate on Foot and Mouth Disease, India·View original on PubMed →
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Original publication title: Truncated recombinant non-structural protein 2C-based indirect ELISA for FMD sero-surveillance.
Plain-English summary
Foot-and-mouth disease (FMD) is a serious illness that affects livestock, caused by a specific virus. In India, farmers are using a vaccine to help prevent this disease, but there are challenges in telling apart vaccinated animals from those that are actually infected. Researchers have developed a new test using a part of the virus called the 2C protein, which is not found in the vaccine, making it a good indicator of infection. They created a test called an indirect ELISA that showed a high accuracy in identifying infected animals, with a sensitivity of nearly 93% and specificity of 94%. This new test could be very useful when combined with existing tests to better monitor the disease in cattle.
Abstract
Foot-and-mouth disease (FMD) is a transboundary animal disease caused by foot-and-mouth disease virus. In India, systematic preventive vaccination using inactivated trivalent (O, A and Asia 1) vaccine is the strategy being adopted to control FMD. The use of non-structural protein (NSP)-contaminated inactivated vaccine raises concerns over differentiation of infected and vaccinated animals (DIVA) by NSP based immunoassays. However, 2C being a membrane associated protein usually remain absent in vaccine formulations and thus, anti-2C response is one of the most reliable indicator of the FMDV infection. In this study, 34 amino acids from N-terminus of 2C protein were removed to eliminate membrane-binding amphipathic helicase activity for the expression of recombinant protein in soluble form. Truncated 2C (2Ct) was utilized for development of an indirect ELISA (I-ELISA) for bovine and the developed 2Ct I-ELISA was validated using a panel constituting of serum of naïve, vaccinated and infected animals. The assay was compared with the in-house r3AB3 I-ELISA and the overall concordance was 85.31%. The diagnostic sensitivity and specificity of the 2Ct I-ELISA were 92.9% and 94.0%, respectively. The apparent prevalence of anti-2C antibodies for random bovine samples tested by the developed assay was 23.7%. The developed ELISA will help in augmenting the sensitivity of detection if used in combination with r3AB3 I-ELISA for sero-surveillance.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/23850716/