Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/121023
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Type: Journal article
Title: Diagnostic accuracy of phenotypic assays for determining antimicrobial resistance status in Staphylococcus pseudintermedius isolates from canine clinical cases
Author: Badger, S.
Abraham, S.
O'Dea, M.
Saputra, S.
Abraham, R.
Worthing, K.
Norris, J.
Trott, D.
Jordan, D.
Caraguel, C.
Citation: Veterinary Microbiology, 2019; 234:101-109
Publisher: Elsevier
Issue Date: 2019
ISSN: 0378-1135
1873-2542
Statement of
Responsibility: 
Skye Badger, Sam Abraham, Mark O’Dea, Sugiyono Saputra, Rebecca J. Abraham, Kate A. Worthing, Jacqueline M. Norris, Darren J. Trott, David Jordan, Charles G.B. Caraguel
Abstract: This study evaluated the diagnostic test accuracy of disc diffusion relative to broth-microdilution for clinical Staphylococcus pseudintermedius isolated from dogs in Australia (n = 614). Accuracy of disc diffusion and broth-microdilution for oxacillin relative to mecA real-time PCR was also assessed. Each isolate had paired minimum inhibitory concentration and zone diameter values for ten antimicrobial agents. Data was dichotomised using Clinical and Laboratory Standards Institute susceptible and resistant clinical breakpoints. Test accuracy was reported using relative diagnostic sensitivity (RSe), specificity (RSp), likelihood ratio pairs, diagnostic odds ratio, and area-under-the receiver-operating characteristic (ROC AUC) analysis. Disc diffusion was found to have high test accuracy for most antimicrobials (ROC AUC range: 0.96 – 0.99) except rifampicin (ROC AUC = 0.80). The RSp of disc diffusion was high for all antimicrobials (range, 97.1%–100%). However, RSe was considerably variable (range, 35.7%–98.8%), particularly for amoxicillin-clavulanic acid (51.5%, 95% CI, 38.9%, 64.0%), cefoxitin (35.7%, 95% CI, 12.8%, 64.9%), and cephalothin (43.6%, 95% CI, 27.8%, 60.4%). When disc diffusion and broth-microdilution were compared to mecA real-time PCR, the overall accuracy of both assays was similar (ROC AUC, 0.99 respectively). However, the RSe for broth-microdilution (96.1%, 95% CI, 88.9%, 99.2%) was significantly higher than for disc diffusion (86.8%, 95% CI, 77.1%, 93.5%) (McNemars mid-p value 0.01). Overall, these findings demonstrate that for most antimicrobials, disc diffusion performed according to CLSI guidelines can be used to differentiate clinical S. pseudintermedius isolates that might otherwise be assessed by broth-microdilution, provided consideration is given to the performance estimates reported here.
Keywords: Disc diffusion; broth-microdilution; accuracy; ROC; antimicrobial resistance; surveillance
Rights: © 2019 Elsevier B.V. All rights reserved.
RMID: 0030117977
DOI: 10.1016/j.vetmic.2019.05.024
Grant ID: http://purl.org/au-research/grants/arc/LP130100736
Appears in Collections:Animal and Veterinary Sciences publications

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