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Table 4 Proportions of antimicrobial resistance among Enterobacteriaceae that were most frequently isolated from bloodstream infections

From: Bloodstream infections caused by multidrug-resistant gram-negative bacteria: epidemiological, clinical and microbiological features

  Escherichia coli
(n = 50)
Klebsiella pneumoniae
(n = 50)
Serratia marcescens
(n = 50)
Enterobacter cloacae (n = 13)
Antimicrobial drug No. of isolates % resistant* No. of isolates % resistant* No. of isolates % resistant* No. of isolates % resistant*
Amikacin 1 2.0 1 6.7
Amp-Sul 28 56.0 31 62.0 15 100 13 100
Pip-Tazo 5** 10.0** 21 52.0 1 6.7 3 23.1
Ceftriaxone 10 20.0 25 50.0 NA NA NA NA
Ceftazidime 10 20.0 25 50.0 NA NA
Cefepime 10 20.0 25 50.0 1 6.7 3 23.1
Cefuroxime 12 24.0 26 52.0 NA NA NA NA
Imipenem 2 4.0 5 10.0 -∆∆ -∆∆ 1 7.7
Meropenem 1 2.0 5 10.0 1 7.7
Ertapenem 1 2.0 5+ 10.0+ 1 6.7 2 15.4
Ciprofloxacin 15 30.0 23 46.0 1§ 6.7§ 5 38.5
Gentamicin 5*** 10.0*** 14 28.0 3 23.1
Polymyxin 1 2.0 15§§ 100§§ 4 30.8
Tigecycline 4 8.0 1Ω 6.7 Ω 1 Ω Ω 7.7 Ω Ω
  1. *Considered resistant or intermediary profile;** Just 1 isolate of E. coli was not tested against piperacillin-tazobactam; *** Just 1 isolate of E. coli was not tested against gentamicin; +just 1 isolate of K. pneumoniae was not tested against ertapenem; 7 isolates of K. pneumoniae were not tested against tigecycline; ∆∆2 isolates of S. marcescens were not tested against imipenem; §2 isolates of S. marcescens were not tested against ciprofloxacin; §§S. marcescens is intrinsically resistant to polymyxin; Ω 1 isolate of S. marcescens were not tested against tigecycline; Ω Ω 3 isolates of E. cloacae were not tested against tigecycline; NA- Not applicable; (−) no resistant microbial isolates