Comparative Activity of Eighteen Antimicrobial Agents against Anaerobic Bacteria Isolated in South Africa |
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Authors: | M M Lubbe P L Botha L J Chalkley |
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Institution: | (1) Department of Medical Microbiology (G4), Faculty of Health Sciences, University of the Orange Free State, PO Box 339, Bloemfontein 9300, South Africa, ZA |
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Abstract: | The in vitro activity of 18 antimicrobial agents was determined against 378 anaerobic bacteria isolated in Bloemfontein,
South Africa, during 1996/97. Against the gram-positive isolates, MICs of penicillin and cefoxitin were >0.5 μg/ml and >16 μg/ml,
respectively, for five and three strains of non-perfringens Clostridium spp. Seventeen Peptostreptococcus anaerobius strains were resistant to penicillin (MIC≥2 μg/ml). All gram-positive anaerobes tested except one Peptostreptococcus sp. and one Clostridium sp. were susceptible to dalfopristin-quinupristin (MICs≤1 μg/ml). The carbapenems exhibited excellent activity against the
gram-positive isolates and were effective against most gram-negative anaerobes, with the exception of the fusobacteria. Only
seven strains exhibited decreased susceptibility to trovafloxacin (MICs>2 μg/ml). In mixed anaerobic/aerobic infections, carbapenems
and the fourth-generation quinolone trovafloxacin were the agents most suitable for us as broad-spectrum monotherapy. |
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