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Journal of Antimicrobial Chemotherapy (2000) 46, 535-540
© 2000 The British Society for Antimicrobial Chemotherapy

Evaluation of the Oxoid Aura image system for measuring zones of inhibition with the disc diffusion technique

J. M. Andrews*, F. J. Boswell and R. Wise

Department of Microbiology, City Hospital NHS Trust, Birmingham B18 7QH, UK

In this study the Oxoid Aura image antibiotic sensitivity test system, used as a stand-alone device, was compared with manual zone measurement and use of a template, for the determination of sensitivities. An overall correlation coefficient of 0.99 was observed for zone diameters measured using the Aura image system and zones measured manually, when the differences between zones were within 3 mm; 5.4% of zones showed a difference in zone diameter between manual and automated measurement of >3 mm. The results obtained using the template method for interpretation were less reliable than zone measurement, with cefuroxime and ampicillin tested against Enterobacteriaceae and Acinetobacter spp. When linked to a laboratory patient database, the bar code and disc identification facilities avoided errors that were associated with manual data entry.

* Corresponding author. Tel: +44-121-507-5693; Fax: +44-121-551-7763.


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