{"title":"Chimeric protein A/G conjugate based lateral flow assay for the rapid detection of brucellosis in multiple animal species","authors":"Rajeswari Shome , Sudipta Patra , Muneera Mohamed Sahib , G. Shanmugam , Somy Skariah , Samer Shamshad , Nagendra Nath Barman , Durlav Prasad Bora , Arijit Shome , Triveni Kalleshamurthy , Nagalingam Mohandoss , Bibek Ranjan Shome","doi":"10.1016/j.jim.2025.113845","DOIUrl":null,"url":null,"abstract":"<div><div>The study highlights diagnostic efficacy of chimeric protein A/G based lateral flow assay (LFA) for on-spot diagnosis of brucellosis in various livestock species. The test device was developed using chimeric protein A/G conjugated with 40 nm colloidal gold nanoparticles as detection reagent having a strong binding affinity specifically IgG isotypes in multiple livestock species. Known positive and negative control sera samples from three livestock species and 36 Gram-negative bacterial cross-reactive hyper immune sera were used for determining the analytical sensitivity (ASn) and specificity (ASp), respectively. The diagnostic performance of LFA was evaluated in comparison with RBPT (Rose Bengal Plate Test) and indirect enzyme linked immunosorbent assay (iELISA) using 652 small ruminants, 532 bovine and 241 pig samples. The analytical sensitivity of LFA was observed up to 1:1280, 1:2560, and 1:10240 dilutions in bovine, small ruminants and pigs samples, respectively. Similarly, non-reactive to 35 Gram-negative bacterial cross-reactive hyper immune sera showed high ASp for LFA test except mild reactivity with <em>Y. enterocolitca</em> O9. Considering RBPT as gold standard, the diagnostic sensitivity (DSn) of protein A/G based LFA in infected farm samples was 93.9 (86.3–97.9) in small ruminants, 84.6 (54.5–98.1) in cattle and 96.5 (82.2–99.9) in swine. Considering iELISA as gold standard, the DSn of LFA was 96.3 (89.4–99.2) in small ruminants, 90 (55.5–99.7) in cattle and 96.7 (82.8–99.9) in swine. The higher performance efficacy of the LFA tests developed in this study outlines the practicality of using these rapid, easy to perform, highly sensitive and specific devices for on-spot screening of brucellosis in livestock species, which in-turn facilitate prevention, control and management of disease transmission in farms.</div></div>","PeriodicalId":16000,"journal":{"name":"Journal of immunological methods","volume":"539 ","pages":"Article 113845"},"PeriodicalIF":1.6000,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of immunological methods","FirstCategoryId":"3","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0022175925000456","RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"BIOCHEMICAL RESEARCH METHODS","Score":null,"Total":0}
引用次数: 0
Abstract
The study highlights diagnostic efficacy of chimeric protein A/G based lateral flow assay (LFA) for on-spot diagnosis of brucellosis in various livestock species. The test device was developed using chimeric protein A/G conjugated with 40 nm colloidal gold nanoparticles as detection reagent having a strong binding affinity specifically IgG isotypes in multiple livestock species. Known positive and negative control sera samples from three livestock species and 36 Gram-negative bacterial cross-reactive hyper immune sera were used for determining the analytical sensitivity (ASn) and specificity (ASp), respectively. The diagnostic performance of LFA was evaluated in comparison with RBPT (Rose Bengal Plate Test) and indirect enzyme linked immunosorbent assay (iELISA) using 652 small ruminants, 532 bovine and 241 pig samples. The analytical sensitivity of LFA was observed up to 1:1280, 1:2560, and 1:10240 dilutions in bovine, small ruminants and pigs samples, respectively. Similarly, non-reactive to 35 Gram-negative bacterial cross-reactive hyper immune sera showed high ASp for LFA test except mild reactivity with Y. enterocolitca O9. Considering RBPT as gold standard, the diagnostic sensitivity (DSn) of protein A/G based LFA in infected farm samples was 93.9 (86.3–97.9) in small ruminants, 84.6 (54.5–98.1) in cattle and 96.5 (82.2–99.9) in swine. Considering iELISA as gold standard, the DSn of LFA was 96.3 (89.4–99.2) in small ruminants, 90 (55.5–99.7) in cattle and 96.7 (82.8–99.9) in swine. The higher performance efficacy of the LFA tests developed in this study outlines the practicality of using these rapid, easy to perform, highly sensitive and specific devices for on-spot screening of brucellosis in livestock species, which in-turn facilitate prevention, control and management of disease transmission in farms.
期刊介绍:
The Journal of Immunological Methods is devoted to covering techniques for: (1) Quantitating and detecting antibodies and/or antigens. (2) Purifying immunoglobulins, lymphokines and other molecules of the immune system. (3) Isolating antigens and other substances important in immunological processes. (4) Labelling antigens and antibodies. (5) Localizing antigens and/or antibodies in tissues and cells. (6) Detecting, and fractionating immunocompetent cells. (7) Assaying for cellular immunity. (8) Documenting cell-cell interactions. (9) Initiating immunity and unresponsiveness. (10) Transplanting tissues. (11) Studying items closely related to immunity such as complement, reticuloendothelial system and others. (12) Molecular techniques for studying immune cells and their receptors. (13) Imaging of the immune system. (14) Methods for production or their fragments in eukaryotic and prokaryotic cells.
In addition the journal will publish articles on novel methods for analysing the organization, structure and expression of genes for immunologically important molecules such as immunoglobulins, T cell receptors and accessory molecules involved in antigen recognition, processing and presentation. Submitted full length manuscripts should describe new methods of broad applicability to immunology and not simply the application of an established method to a particular substance - although papers describing such applications may be considered for publication as a short Technical Note. Review articles will also be published by the Journal of Immunological Methods. In general these manuscripts are by solicitation however anyone interested in submitting a review can contact the Reviews Editor and provide an outline of the proposed review.