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Table 1 In vitro activities of colistin, imipenem, and ceftazidime against drug-resistant Pseudomonas aeruginosa and Acinetobacter baumannii isolates

From: In vitro activities of colistin, imipenem and ceftazidime against drug-resistant Pseudomonas aeruginosa and Acinetobacter baumannii isolates in the south of Iran

Organism and antimicrobial agents CLSI Breakpoint (μg/mL) MIC (μg/mL) Susceptibility (%)
S I R Range 50% 90% S I R
A. baumannii
 Imipenem  ≤ 2 4  ≥ 8 8–> 32  > 32  > 32 0 0 100
 Ceftazidime  ≤ 8 16  ≥ 32 16–> 256 32  > 256 0 16.7 83.3
 Colistin  ≤ 2  ≥ 4 0.19–1.5 0.75 1.5 100 0
P. aeruginosa
 Imipenem  ≤ 2 4  ≥ 8 1.5–> 32 6  > 32 23.8 33.3 42.9
 Ceftazidime  ≤ 8 16  ≥ 32 0.75–> 256 2  > 256 81 0 19
 Colistin  ≤ 2  ≥ 4 0.094–1.5 0.5 1 100 - 0