Antibiotics Link - http://www.hhmi.org/biointeractive/Antibiotics_Attack/frameset.html

Kirby Bauer Testing

Minimum Inhibitory Concentration - MIC-http://gold.aecom.yu.edu/id/micro/directsensi.htm

 

 

 

 

 

 

 

 

Antibiotic Staphylococcus aureus ( SA )

 +/-                                    zone of inhibition

Escherichia coli or Gram - Bacterium

+/-                                         zone of inhibition

Tetracycline        
Erythromycin        
Ampicillin        
Chloramphenicol        
         
         

 

 

ZONE SIZE INTERPETIVE CHART FOR THE KIRBY-BAUER TEST 
 
 
ANTIMICROBIAL AGENT  DISC CODE  R = mm  
 or less
 I = mm  
 range
  MS =   S = mm  
 or more 
 Amoxicillin (Staph)

AMC

19

 

 

20

Amoxicillin (other bacteria)

AMC

13

14-17

 

18

 Ampicillin (Staph)

AM

28

 

 

29

 Ampicillin (other bacteria)

AM

11

12-13

 

14

 Carbenicillin (Pseudomonas)

CB

13

14-16

 

17

 Carbenicillin (other bacteria)

CB

17

18-22

 

23

 Cefoxatime

CTX

14

 

15-22

23

 Cephalothin

CF

14

15-17

 

18

Chloramphenicol

C

12

13-17

 

18

 Erythromycin

E

13

14-22

 

23

 Gentamycin

GM

12

13-14

 

15

 Methicillin (used for Staph only)

M (or DP)

9

10-13

 

14

Penicillin

P

28

 

 

29

 Streptomycin

S

11

12-14

 

15

 Sulfamethoxazole-trimethoprim

SXT-TMP

10

11-15

 

16

 Tetracycline

TE

14

15-18

 

19

Antibiotic Mode of Action