Antigen-specific interferon-gamma release is decreased following the single intradermal comparative cervical skin test in African buffaloes (Syncerus caffer).

Autor: Clarke C; DST/NRF Centre of Excellence for Biomedical TB Research/SAMRC Centre for Tuberculosis Research/Division of Molecular Biology and Human Genetics, Faculty of Medicine and Health Sciences, Stellenbosch University, P.O. Box 241, Cape Town, 8000, South Africa., Cooper D; Ezemvelo KZN Wildlife, P.O. Box 25, Mtubatuba, 3935, South Africa., Goosen WJ; DST/NRF Centre of Excellence for Biomedical TB Research/SAMRC Centre for Tuberculosis Research/Division of Molecular Biology and Human Genetics, Faculty of Medicine and Health Sciences, Stellenbosch University, P.O. Box 241, Cape Town, 8000, South Africa., McFadyen R; DST/NRF Centre of Excellence for Biomedical TB Research/SAMRC Centre for Tuberculosis Research/Division of Molecular Biology and Human Genetics, Faculty of Medicine and Health Sciences, Stellenbosch University, P.O. Box 241, Cape Town, 8000, South Africa., Warren RM; DST/NRF Centre of Excellence for Biomedical TB Research/SAMRC Centre for Tuberculosis Research/Division of Molecular Biology and Human Genetics, Faculty of Medicine and Health Sciences, Stellenbosch University, P.O. Box 241, Cape Town, 8000, South Africa., van Helden PD; DST/NRF Centre of Excellence for Biomedical TB Research/SAMRC Centre for Tuberculosis Research/Division of Molecular Biology and Human Genetics, Faculty of Medicine and Health Sciences, Stellenbosch University, P.O. Box 241, Cape Town, 8000, South Africa., Parsons SDC; DST/NRF Centre of Excellence for Biomedical TB Research/SAMRC Centre for Tuberculosis Research/Division of Molecular Biology and Human Genetics, Faculty of Medicine and Health Sciences, Stellenbosch University, P.O. Box 241, Cape Town, 8000, South Africa., Miller MA; DST/NRF Centre of Excellence for Biomedical TB Research/SAMRC Centre for Tuberculosis Research/Division of Molecular Biology and Human Genetics, Faculty of Medicine and Health Sciences, Stellenbosch University, P.O. Box 241, Cape Town, 8000, South Africa. Electronic address: miller@sun.ac.za.
Jazyk: angličtina
Zdroj: Veterinary immunology and immunopathology [Vet Immunol Immunopathol] 2018 Jul; Vol. 201, pp. 12-15. Date of Electronic Publication: 2018 May 15.
DOI: 10.1016/j.vetimm.2018.05.002
Abstrakt: Effective disease management of wildlife relies on the strategic application of ante-mortem diagnostic tests for early identification and removal of M. bovis-infected animals. To improve diagnostic performance, interferon-gamma release assays (IGRAs) are often used in conjunction with the tuberculin skin test (TST). Since buffaloes are major maintenance hosts of M. bovis, optimal application of bovine TB diagnostic tests are especially important. We aimed to determine whether the timing of blood collection relative to the TST has an influence on IFN-γ production and diagnostic outcome in African buffaloes. Release of IFN-γ in response to bovine purified protein derivative (PPD), avian PPD and PC-HP ® and PC-EC ® peptides was measured by Bovigam ® and an in-house IGRA in a group of Bovigam ® -positive and - negative buffaloes at the time the TST was performed and three days later. There was significantly lower IFN-γ release in response to these antigens post-TST in Bovigam ® -positive buffaloes, but no significant changes in Bovigam ® -negative buffaloes. Also, a significantly greater proportion of buffaloes were Bovigam ® -positive prior to the TST than three days later. We therefore recommend that blood samples for use in IGRAs be collected prior to or at the time the TST is performed to facilitate the correct identification of greater numbers of IGRA-positive buffaloes.
(Copyright © 2018 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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