Table 3.

Antibiotic susceptibilities of integron-positive A. baumannii and integron-negative Acinetobacterspecies isolates

Antibacterial agentSusceptibility of isolatesPb
Integron positive (n = 24)Integron negative (n = 24)
MIC50 (mg/liter)% SaMIC50 (mg/liter)% S
Amikacin3238177<0.01
Gentamicin3240.2569<0.001
Tobramycin32250.2577<0.001
Ciprofloxacin8170.2588<0.001
Trimethoprim-sulfamethoxazole16021573<0.001
Ampicillin6401627
Amoxicillin-clavulanic acid648469<0.001
Piperacillin-tazobactam6442473<0.05
Cefuroxime644644NS
Cefotaxime3281638<0.05
Ceftazidime1638481<0.01
Imipenem283292NS
Meropenem196196NS
  • a Percentage of strains that are susceptible according to NCCLS breakpoints.

  • b Statistical significance of the difference between the number of susceptible integron-positive isolates and the number of susceptible integron-negative isolates (by Fisher's exact test). NS, not significant.