Susceptibilities of beta-lactamase-positive and -negative strains of Campylobacter coli to beta-lactam agents.
The percentages of susceptibility of 28 strains of Campylobacter coli to beta-lactam agents were 96% for amoxicillin and ampicillin, 57% for ticarcillin, 4% for cefoxitin and cefuroxime, 61% for cefotaxime, and 11% for ceftazidime. None of the strains were susceptible to penicillin G, piperacillin, cefazolin, cephalothin, cefamandole, and cefoperazone. All strains were susceptible to imipenem and ciprofloxacin, and 21% were susceptible to erythromycin. A beta-lactamase was detected in 68% of the strains by cefinase disks and by the nitrocefin method. The beta-lactamase-positive strains were significantly less susceptible to amoxicillin, ampicillin, and ticarcillin than the beta-lactamase-negative strains (P < or = 0.003). Clavulanic acid (0.25 microgram/ml) but not sulbactam and tazobactam (2 micrograms/ml) lowered to susceptible levels the amoxicillin and ampicillin MICs of the only strain of C. coli resistant to amoxicillin, ampicillin, and ticarcillin.
Service de Microbiologie Médicale et Maladies Infectieuses, Hôpital Saint-Luc, Montreal, Quebec, Canada.
N
N
Lachance
C
C
Gaudreau
F
F
Lamothe
F
F
Turgeon
D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D017000:Campylobacter coli / Q000187:drug effects* / Q000201:enzymology; D019818:Clavulanic Acid; D002969:Clavulanic Acids / Q000494:pharmacology; D008826:Microbial Sensitivity Tests; D010397:Penicillanic Acid / Q000494:pharmacology; D013407:Sulbactam / Q000494:pharmacology; D000078142:Tazobactam; D065093:beta-Lactamase Inhibitors; D001618:beta-Lactamases / Q000378:metabolism*
D000900:Anti-Bacterial Agents; D002969:Clavulanic Acids; D065093:beta-Lactamase Inhibitors; D019818:Clavulanic Acid; D010397:Penicillanic Acid; D001618:beta-Lactamases; D013407:Sulbactam; D000078142:Tazobactam