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Journal of Clinical Microbiology, 01 1995, 235-238, Vol 33, No. 1
Copyright © 1995 by the American Society for Microbiology. All rights reserved.

Interpretive criteria and quality control parameters for testing bacterial susceptibility to the fluoroquinolone PD131628

AL Barry, PC Fuchs, SD Allen, FC Tenover, JH Jorgensen and LB Reller
Clinical Microbiology Institute, Tualatin, Oregon 97062.

For testing bacterial susceptibility to PD131628, a 5-micrograms disk and the following tentative interpretive criteria may be used: > or = 19 mm for susceptible (MIC, < or = 1.0 micrograms/ml), 16 to 18 mm for intermediate (MIC, 2.0 micrograms/ml), and < or = 15 mm for resistant (MIC, > or = 4.0 micrograms/ml). For standard quality control strains, the following limits are proposed: for Escherichia coli ATCC 25922, zones of 31 to 41 mm or a MIC of 0.002 to 0.016 micrograms/ml; for Pseudomonas aeruginosa ATCC 27853, zones of 26 to 34 mm or a MIC of 0.12 to 0.5 micrograms/ml; for Staphylococcus aureus ATCC 25923, zones of 27 to 33 mm; for Staphylococcus aureus ATCC 29213, a MIC of 0.03 to 0.12 micrograms/ml; and for Enterococcus faecalis ATCC 29212, a MIC of 0.12 to 0.5 micrograms/ml.