Combination Effect of Cefmenoxime with Four Aminoglycosides on Enterobacteriaceae Susceptible and Moderately Susceptible to this New Cephalosporin

The inhibitory combination effect of cefmenoxime with gentamicin, tobramycin, netilmicin and amikacin against 148 Enterobacteriaceae was compared using the checkerboard agar dilution technique. On average 41% of cefmenoxime-moderately susceptible (MIC between 2 and 32 μg/ml) or cefmenoxime-resistant (MIC > 32 μg/ml) strains were inhibited by synergistic, and 23,5% by partial synergistic cefmenoxime-aminoglycosides combinations. Against cefmenoxime-susceptible strains, these rates of synergy or partial synergy were twofold lower, but only one isolate was not susceptible to these combinations. The amikacin-cefmenoxime interaction was the most performant.