Comparative antibacterial activity of imipenem (IPM), panipenem (PAPM), meropenem (MEPM) and biapenem (BIPM) was determined against 288 clinical isolates of P aeruginosa collected from various hospitals in 2000. The order of activity by comparison of MIC
50/MIC
80/MIC
90 was: MEPM (1/4/8 μg/ml) >BIPM (1/4/16 μg/ml) >IPM (2/4/16 μg/ml) >PAPM (8/16/32 μg/ml). Moreover, the order of activity against 75 strains of P aeruginosa (MIC of CAZ, AZT was≥16μ/ml and MIC of IPM, MEPM was ≤_8μg/ml) by comparison of MIC
50/MIC
80/MIC
90 was: BIPM (1/2/8 μg/ml)≥MEPM (1/4/8 μg/ml)≥ IPM (2/2/8 μg/ml) >PAPM (8/16/16 μg/ml). Judging from both correlation between the MICs of carbapenems and relationship between class C β-lactamase activity and drug susceptibility of carbapenems, it becomes apparent that carbapenems, especially BIPM and MEPM will be useful for treatment of antipseudomonal cephem resistant pseudomonas infection.
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