Performance of indirect enzyme-linked immunosorbent assay using Trichinella spiralis-derived serpin as antigen for the detection of exposure to Trichinella spp. in swine

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creativework.keywords - en

Trichinella

Trichinellosis and other foodborne zoonotic pathogens

creativework.keywords - fr

Trichinella

Trichinellose et autres pathogènes zoonotiques d'origine alimentaire

dc.contributor.author

Lobanov, Vladislav A.

Konecsni, Kelly A.

Purves, Randy W.

Scandrett, W. Brad

dc.date.accessioned

2023-06-05T18:11:23Z

dc.date.available

2023-06-05T18:11:23Z

dc.date.issued

2022

dc.description.abstract - en

Indirect enzyme-linked immunosorbent assay (ELISA) utilizing excretory-secretory (E-S) antigens of Trichinella spiralis is currently the method of choice for testing pigs and wild boars for exposure to Trichinella spp. The E-S proteins are released by first-stage larvae (L1) of this parasitic nematode maintained in vitro. However, the production of these antigens is cumbersome and time-consuming. The process requires animals to be experimentally infected with the parasite as the source of L1. Antigen production using recombinant technology would be more time- and cost-effective. In this study, we produced a serpin of T. spiralis as a recombinant protein secreted by the yeast Pichia pastoris. The diagnostic performance of indirect ELISA with purified serpin antigen was compared to that of E-S ELISA. Both Serpin ELISA and E-S ELISA demonstrated 98% diagnostic specificity in testing 1056 pigs from the Canadian Trichinella-free commercial herd. Twenty of 21 pigs with non-negative test results in E-S ELISA tested negative by the confirmatory Western blot (WB) assay. Therefore, the diagnostic specificity of combined E-S ELISA and WB was 99.9%. Forty-five sera collected at or after six weeks from 34 pigs experimentally infected with various numbers of T. spiralis L1 produced positive results in both E-S and Serpin ELISA, resulting in 100% diagnostic sensitivity. However, testing of sera serially collected from four pigs experimentally infected with various low doses of T. spiralis L1 demonstrated a delayed serpin-specific antibody response compared to seroconversion detected by E-S ELISA in three animals. Moreover, Serpin ELISA demonstrated significantly lower sensitivity for detecting antibodies induced by experimental infections of pigs with T. britovi, T. nativa, Trichinella T6 and T. pseudospiralis, suggesting that it will not provide consistent detection of exposure to sylvatic Trichinella spp. The validation data support the application of Serpin ELISA in seroepidemiological surveys for detecting exposure to T. spiralis in swine.

dc.identifier.citation

Lobanov, V. A., Konecsni, K. A., Purves, R. W., & Scandrett, W. B. (2022). Performance of indirect enzyme-linked immunosorbent assay using Trichinella spiralis-derived serpin as antigen for the detection of exposure to Trichinella spp. in swine. [Article in press]. Veterinary Parasitology.

dc.identifier.doi

https://doi.org/10.1016/j.vetpar.2022.109744

dc.identifier.uri

https://open-science.canada.ca/handle/123456789/553

dc.language.iso

en

dc.rights - en

Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)

dc.rights - fr

Creative Commons Attribution - Pas d'utilisation commerciale - Pas de modification 4.0 International (CC BY-NC-ND 4.0)

dc.rights.uri - en

https://creativecommons.org/licenses/by-nc-nd/4.0/

dc.rights.uri - fr

https://creativecommons.org/licenses/by-nc-nd/4.0/deed.fr

dc.subject - en

Agriculture

dc.subject - fr

Agriculture

dc.subject.en - en

Agriculture

dc.subject.fr - fr

Agriculture

dc.title - en

Performance of indirect enzyme-linked immunosorbent assay using Trichinella spiralis-derived serpin as antigen for the detection of exposure to Trichinella spp. in swine

dc.type - en

Accepted manuscript

dc.type - fr

Manuscrit accepté

local.pagination

1-38

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