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Distribution of inhibition zone diameters for erythromycin and tetracycline. The NCCLS interpretive breakpoints (sensitive, intermediate, and resistant) were as follows: for erythromycin, ≥21, 16 to 20, and ≤15 mm; and for tetracycline, ≥23, 19 to 22, and ≤18 mm. The broken lines indicate the cutoff for resistance.
