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  • Title: Susceptibility of anaerobic bacteria to ten antimicrobial agents.
    Author: Appelbaum PC, Chatterton SA.
    Journal: Antimicrob Agents Chemother; 1978 Sep; 14(3):371-6. PubMed ID: 708014.
    Abstract:
    The susceptibility pattern of 265 anaerobic bacteria from clinical isolates to 10 antimicrobial agents was investigated by the agar dilution technique. Penicillin G, in a concentration of 16 mug/ml, was active against most organisms, important exceptions being 12% of Bacteroides melaninogenicus and 24% of B. fragilis strains. The susceptibility of strains to ampicillin was similar to their susceptibility to penicillin G. Carbenicillin, at </=128 mug/ml, inhibited all but a few strains. Cefamandole was less active than the penicillins; 82% of B. melaninogenicus, 32% of B. fragilis, and 75% of Fusobacterium strains were inhibited by </=16 mug/ml. A trend towards tetracycline resistance was seen in many bacterial groups, especially Bacteroides, Fusobacterium, and Clostridium. All organisms were susceptible to chloramphenicol and clindamycin in concentrations of </=16 mug/ml and </=4 mug/ml, respectively. Erythromycin was less active than clindamycin against all strains tested. Metronidazole and tinidazole were active against most anaerobes, but resistance of a few strains in each group was encountered. The increased resistance of B. melaninogenicus strains to penicillin, and emergence of anaerobes resistant to >16 mug of imidazole per ml may have therapeutic implications.
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