Factors affecting the in vitro activity of cefoperazone against the Bacteroides fragilis group
Sutter, V.L.; Kwok, Y.Y.
Antimicrobial Agents and Chemotherapy 20(6): 723-725
1981
ISSN/ISBN: 0066-4804 PMID: 6459765 Document Number: 173346
The in vitro activity of cefoperazone against 32 strains of bacteria of the B. fragilis group was determined on 4 media by using a variety of test parameters. Lower mean minimal inhibitory concentrations (MIC) were obtained on Mueller-Hinton blood agar and supplemented brain heart infusion agar than were obtained on brucella laked blood agar or Wilkins-Chalgren agar. Higher MIC were obtained with 6-h inocula than with 24-h inocula and slightly higher MIC were obtained with tests read at 48 h as compared with 24 h. Conducting tests in an anaerobic glove box had little effect. The greatest differences in mean MIC were seen with inoculum densities of 104 and 105 colony forming units.