A rapid test for the environmental detection of pigeon antigen

Avoidance of inhaled bird antigens is essential to prevent hypersensitivity pneumonitis disease progression. The aim of the present study was to develop a sandwich enzyme link immunoassay (ELISA) and an immunochromatographic test (ICT) and compare their ability to detect pigeon antigens in environme...

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Bibliographic Details
Published in:The Science of the total environment 2021-09, Vol.788, p.147789, Article 147789
Main Authors: Sánchez-Díez, Silvia, Cruz, María-Jesús, Álvarez-Simón, Daniel, Montalvo, Tomás, Muñoz, Xavier, Hoet, Peter M., Vanoirbeek, Jeroen A., Gómez-Ollés, Susana
Format: Article
Language:English
Subjects:
Hypersensitivity pneumonitis
Immunochromatographic test
Pigeon antigen
Strip assay
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Summary:Avoidance of inhaled bird antigens is essential to prevent hypersensitivity pneumonitis disease progression. The aim of the present study was to develop a sandwich enzyme link immunoassay (ELISA) and an immunochromatographic test (ICT) and compare their ability to detect pigeon antigens in environmental samples. An amplified sandwich ELISA using pigeon serum as a calibration standard and a ICT using gold-labeled anti-pigeon serum antibodies for the rapid detection of pigeon antigens in environmental samples were developed. Twenty-two different airborne samples were collected and analysed using both methods. Strip density values obtained with ICT were calculated and compared with the concentrations determined by the ELISA method for pigeon antigens. Strips results were also visually analysed by five independent evaluators. The ELISA method to quantify pigeon antigen had a broader range (58.4 and 10,112.2 ng/ml), compared to the ICT assay (420 to 3360 ng/ml). A kappa index of 0.736 (p < 0.0001) was obtained between the observers evaluating the ICT strips. The results of the ELISA and the relative density of the ICT showed a highly significant correlation (rs:0.935; p < 0.0001). Bland-Altman plot also confirmed excellent agreement between the two methods (mean difference: −1.626; p < 0.0001). Since there was a good correlation between both assays, we can conclude that the rapid and simple ICT assay is a good and valid alternative, which does not require expensive equipment, for the validated ELISA technique. [Display omitted] •Demonstrating antigen exposure is critical in the diagnosis and management of hypersensitivity pneumonitis.•An immunochromatographic test is compared with an ELISA method for the measurement of pigeon antigens in the environment.•The immunochromatographic test described was highly consistent with the validated ELISA and does not require specific skills.•This method may prove to be a useful tool for predicting the progression of bird-related hypersensitivity pneumonitis.
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2021.147789