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Table 1 Antibiotic susceptibility of multiresistant P.aeruginosa clone strains

From: A large sustained endemic outbreak of multiresistant Pseudomonas aeruginosa: a new epidemiological scenario for nosocomial acquisition

  Range MIC50 MIC90 Breakpoint %Ia %Rb Breakpoint %Ia Rb
     CLSI 2009    EUCAST2009   
     S R    S R   
PIP ≤ 16- > 64 64 > 64 ≤ 64 ≥128 - 39 ≤ 16 > 16 - 97
TIC ≤ 16- > 64 64 > 64 ≤ 64 ≥128 - 42 ≤ 16 > 16 - 98
TZP ≤ 16/4- > 64/4 64/4 > 64/4 ≤ 64/4 ≥128/4 - 35 ≤ 16/4 > 16/4 - 93
ATM 2- > 16 16 > 16 ≤ 8 ≥32 85 14 ≤ 1 > 16 85 14
CAZ 2- > 16 16 > 16 ≤ 8 ≥32 75 22 ≤ 8 > 8 - 97
FEP 2- > 16 16 > 16 ≤ 8 ≥32 82 17 ≤ 8 > 8 - 99
GEN ≤ 4- > 8 > 8 > 8 ≤ 4 ≥16 0 99 ≤ 4 > 4 - 99
TOB ≤ 4- > 8 > 8 > 8 ≤ 4 ≥16 1 95 ≤ 4 > 4 - 96
AMK ≤ 8- > 16 ≤ 8 > 16 ≤ 16 ≥64 0 21 ≤ 8 > 16 29 21
IPM 8- > 8 > 8 > 8 ≤ 4 ≥16 10 90 ≤ 4 > 8 10 90
MEM 8- > 8 > 8 > 8 ≤ 4 ≥16 33 67 ≤ 2 > 8 33 67
CIP 2- > 2 > 2 > 2 ≤ 1 ≥4 2 98 ≤ 0.5 > 1   100
Colistin ≤ 2 ≤ 2 ≤ 2 ≤ 2 ≥4 0 0 ≤ 2 > 2 0 0
  1. a Intermediate.
  2. b Resistant.
  3. PIP = Piperacillin; TIC = Ticarcillin; TZP = Piperacillin-tazobactam; ATM = Aztreonam; CAZ = Ceftazidime; FEP = Cefepime; GEN = Gentamicin; TOB = Tobramycin; AMK = Amikacin; IPM = Imipenem; MEM = Meropenem; CIP = Ciprofloxacin.