Impact of Mycobacterium bovis-induced pathology on interpretation of QuantiFERON®-TB Gold assay results in African buffaloes (Syncerus caffer).
Vet Immunol Immunopathol
; 217: 109923, 2019 Nov.
Article
em En
| MEDLINE
| ID: mdl-31470250
ABSTRACT
The cytokine interferon gamma-inducible protein 10 (IP-10) is a sensitive biomarker of Mycobacterium bovis (M. bovis) infection in African buffaloes (Syncerus caffer). However, elevated levels of IP-10 in QuantiFERON®-TB Gold (QFT) unstimulated whole blood compromises the utility of this biomarker. In this study, IP-10 and interferon gamma (IFN-γ) concentrations in whole blood samples from M. bovis culture-confirmed buffaloes with varying degrees of pathological changes (n = 72) and uninfected controls (n = 70) were measured in the IP-10 release assay (IPRA) and IFN-γ release assay (IGRA), respectively. Findings suggest that concentrations of both cytokines in QFT Nil tubes were higher in infected buffaloes with macroscopic pathological changes consistent with bovine tuberculosis compared to uninfected controls, and IGRA values increased with more severe pathological changes in infected buffaloes (p < 0.05). Finally, in culture-confirmed buffaloes with IPRA-negative and IGRA-positive test results, most animals were also those with the most advanced pathology. We conclude that IP-10 and IFN-γ concentrations measured in QFT Nil tubes may provide insight into the presence of M. bovis pathology in infected buffaloes. Furthermore, this study highlights the value in evaluating cytokine production in both antigen-stimulated and unstimulated samples when interpreting cytokine release assay results.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Kit de Reagentes para Diagnóstico
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Tuberculose Bovina
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Interferon gama
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Quimiocina CXCL10
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Testes de Liberação de Interferon-gama
Tipo de estudo:
Diagnostic_studies
Limite:
Animals
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article