The Kirby Bauer Method determines whether the bacteria in this Kirby Bauer test are resistant (R), intermediate (I), or susceptible (S). It also determines the diameter of the zones of inhibition. Antibiotic Resistant (mm) Intermediate (mm) Susceptible (mm) 15*25 225 8 13 142 21 22 12.25 225
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Table 3.4 Results of Kirby-Bauer antibiotic susceptibility tests for E. coli, P. aeruginosa, and S. aureus. Antibiotic | E. coli Zone of Inhibition (mm) | E. coli Degree of inhibition* | P. aeruginosa Zone of Inhibition (mm) | P. aeruginosa Degree of inhibition* | S. aureus Zone of Inhibition (mm) | S. aureus Degree of inhibition* --- | --- | --- | --- | --- | --- | --- Amoxicillin (AMC) | 12 mm | R | 0 mm | R | 0 mm | R Cephalothin (CF) | 18 mm | S | 0 mm | R | 0 mm | R Chloramphenicol (C) | 30 mm | S | 16 mm | I | 0 mm | R Ciprofloxacin (CIP) | 30 mm | S | 41 mm | S | 0 mm | R Clindamycin (CC) | 0 mm | R | 0 mm | R | 0 mm | R Erythromycin (E) | 0 mm | R | 0 mm | R | 0 mm | R Oxacillin (OX) | 0 mm | R | 0 mm | R | 0 mm | R Penicillin (P) | 0 mm | R | 0 mm | R | 0 mm | R Streptomycin (S) | 19 mm | S | 0 mm | R | 0 mm | R Tetracyclin (TE) | 18 mm | I | 0 mm | R | 0 mm | R Tobramycin (TM) | 25 mm | S | 18 mm | S | 0 mm | R Trimethoprim sulfa (SXT) | 29 mm | S | 0 mm | R | 0 mm | R Vancomycin (VA) | | | | | 17 mm | S Blank (no code) | Not included | | Not included | | Not included | *Susceptible (S), Resistant (R), Intermediate (I). No measurements for shaded boxes.
Josee P.
TABLE 1 Antibiotic Inhibitory Zone Chart Antibiotics Nose Culture Ear Culture Zone Diameter S, R, or I Zone Diameter S, R, or I ZONE SIZE INTERPRETIVE CHART FOR THE KIRBY-BAUER TEST ANTIBIOTIC DISC CODE R mm or less I mm range S mm or more Amoxicillin AMC 19 20 Ampicillin AM 13 14 Erythromycin E 12 13-16 17 Penicillin P 18 19 Streptomycin S 11 12-14 15 Tetracycline TE 7 8-12 13 R = resistant I = intermediate S = sensitive
Sri K.
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