Immunoglobulin G1 enzyme-linked Immunosorbent assay for diagnosis of Johne's disease in red deer (Cervus elaphus)

J.F.T. Griffin, E. Spittle, C.R. Rodgers, S. Liggett, M. Cooper, D. Bakker, J.P. Bannantine

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    50 Citations (Scopus)

    Abstract

    This study was designed to develop a customized enzyme-linked immunosorbent assay (ELISA) for the serodiagnosis of Johne's disease (JD) in farmed deer. Two antigens were selected on the basis of their superior diagnostic readouts: denatured purified protein derivative (PPDj) and undenatured protoplasmic antigen (PpAg). ELISA development was based on the antigen reactivity of the immunoglobulin G1 (IgG1) isotype, which is a highly specific marker for mycobacterial disease seroreactivity in deer. Sensitivity estimates and test parameters were established using 102 Mycobacterium paratuberculosis-infected animals from more than 10 deer herds, and specificity estimates were determined using 508 uninfected animals from 5 known disease-free herds. A receiver-operated characteristic analysis determined that at a cut point of 50 ELISA units, there was a specificity of 99.5% and sensitivities of 84.0% with PPDj antigen, 88.0% with PpAg, and 91.0% when the antigens were used serially in a composite test. Estimated sensitivity was further improved using recombinant protein antigens unique for M. paratuberculosis, which identified infected animals that were unreactive to PPDj or PpAg. While 80% of animals that were seropositive in the IgG1 ELISA had detectable histopathology, the assay could also detect animals with subclinical disease. The test was significantly less sensitive (75%) for animals that were culture positive for M. paratuberculosis but with no detectable pathology than for those with pathological evidence of JD (>90%). When the IgG1 ELISA was used annually over a 4-year period in a deer herd with high levels of clinical JD, it eliminated clinical disease, increased production levels, and reduced JD-related mortality
    Original languageEnglish
    Pages (from-to)1401-1409
    JournalClinical and Diagnostic Laboratory Immunology
    Volume12
    Issue number12
    DOIs
    Publication statusPublished - 2005

    Keywords

    • avium subsp paratuberculosis
    • mycobacterium-bovis
    • antibody-responses
    • serologic survey
    • new-zealand
    • tuberculosis
    • infection
    • elisa
    • protein
    • cattle

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