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  • Title: Parallel testing increases detection of Mycobacterium bovis-infected African buffaloes (Syncerus caffer).
    Author: Bernitz N, Goosen WJ, Clarke C, Kerr TJ, Higgitt R, Roos EO, Cooper DV, Warren RM, van Helden PD, Parsons SDC, Miller MA.
    Journal: Vet Immunol Immunopathol; 2018 Oct; 204():40-43. PubMed ID: 30596379.
    Abstract:
    The diagnosis of Mycobacterium bovis (M. bovis) infection in African buffaloes (Syncerus caffer) relies on detection of the cell-mediated immune response to M. bovis antigens using the single comparative intradermal tuberculin test (SCITT) or interferon gamma release assays (IGRAs). The aim of the present study was to determine whether parallel testing with the SCITT and an IGRA increases the number of M. bovis-infected buffaloes detected by these assays. Culture-confirmed animals (n = 71) tested during routine bovine tuberculosis (bTB) control programmes in Hluhluwe iMfolozi Park and Madikwe Game Reserve in South Africa, were used in this study. Results from 35 buffaloes tested using the SCITT and three Bovigam® IGRAs (cohort A) and 36 buffaloes tested using the SCITT, standard Bovigam® IGRA and Qiagen Cattletype IGRA (cohort B) were analysed. The parallel use of the SCITT with selected IGRAs was able to identify all animals in both cohorts. These findings are in agreement with cattle studies supporting the use of the SCITT and IGRAs in parallel to identify the greatest number of M. bovis-infected animals. The suggested parallel testing algorithm should be strategically applied to maximize detection of M. bovis infection in bTB-positive buffalo herds.
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