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Antimicrob Agents Chemother. 1973 February; 3(2): 188-193
Copyright © 1973 American Society for Microbiology. All Rights Reserved.

Susceptibility of Bacteroides fragilis to Six Antibiotics Determined by Standardized Antimicrobial Disc Susceptibility Testing

Vera L. Sutter, Yung-Yuan Kwok and Sydney M. Finegold

Anaerobic Bacteriology Laboratory and Department of Medicine, Wadsworth Hospital Center, Veterans Administration, Los Angeles, California 90073
Department of Medicine, U.C.L.A. School of Medicine, Los Angeles, California 90024

ABSTRACT

The susceptibility of 100 or more strains of Bacteroides fragilis to six antibiotics was determined by standardized agar dilution and disc diffusion tests. Good correlation of results of the two methods was obtained with chloramphenicol, clindamycin, lincomycin, penicillin, and vancomycin. Correlation of results with erythromycin was not as good. A great deal of overlapping of zone diameters among strains classed as susceptible, intermediate, and resistant occurred with both erythromycin and lincomycin, making interpretation of disc diffusion tests difficult. All strains tested were susceptible to chloramphenicol; 94% were susceptible to clindamycin at concentrations readily achieved with ordinary dosage, and all strains were inhibited by 6.2 µg/ml, a level which is achieved with somewhat more intensive therapy. Only 7% were shown to be susceptible to erythromycin and 13% to lincomycin under the conditions of our testing procedure. Only a small percentage of the strains were susceptible to penicillin, and none was susceptible to vancomycin.

Antimicrob Agents Chemother. 1973 February; 3(2): 188-193
Copyright © 1973 American Society for Microbiology. All Rights Reserved.





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