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Comparative activity in vitro of ticarcillin, BL-P1654, and carbenicillin



Comparative activity in vitro of ticarcillin, BL-P1654, and carbenicillin



Antimicrobial Agents and ChemoTherapy 10(2): 241-244



The activity of ticarcillin, BL-P1654, and carbenicillin was compared in vitro using a microtiter tube dilution test in Mueller-Hinton broth against 50 recent clinical isolates each of Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli, Klebsiella species, Enterobacter species, Proteus species, and Pseudomonas aeruginosa. Bactericidal end points were determined using a modified Steers replicator. Ticarcillin was generally two to four times more active against all organisms tested except S. epidermidis against which BL-P1654 was most active. Median minimum inhibitory concentrations in micrograms per milliliter were for S. aureus: ticarcillin (6.2), carbenicillin (12.5), BL-P1654 (25); for S. epidermidis: BL-P1654 (1.6), ticarcillin (3.2), carbenicillin (3.2); for E. coli: ticarcillin (3.2), BL-P1654 (6.2), carbenicillin (6.2); for Klebsiella sp.: >100 for all three drugs; for Enterobacter sp.: ticarcillin (3.2), carbenicillin (6.2), BL-P1654 (12.5); for Proteus sp.: ticarcillin (1.6), carbenicillin (1.6), BL-P1654 (3.2); for P. aeruginosa: ticarcillin (31), BL-P1654 (62), carbenicillin (125). Bactericidal end points were dependent on both the drug and the species but were in general no more than twofold more than the minimum inhibitory concentration with the exception of BL-P1654 against P. aeruginosa. BL-P1654 was bactericidal for only 60% of the strains tested at a concentration of 500 mug/ml.

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Accession: 039614455

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PMID: 984764

DOI: 10.1128/aac.10.2.241


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