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Table 2 Pseudomonas aeruginosa (138 strains): results of GDM versus BMD as the reference method

From: Gradient diffusion antibiogram used directly on bronchial aspirates for a rapid diagnosis of ventilator-associated pneumonia

Antibiotic/methodRangeMIC 50MIC 90Susceptible (%)Intermediate (%)Resistant (%)KappaMinor error (%)Major and very major error (%)
Ceftazidime GDM0.064- > 2562192102 (73.9)13 (9.4)23 (16.7)81.79 (6.5)1 (0.7)*
Ceftazidime BMD< 0.06- > 324> 32106 (76.8)6 (4.3)26 (18.8)
Ceftolozane-tazobactam GDM0.047- > 2560.51.5135 (97.8)3 (2.2)85.41 (0.7)
Ceftolozane-tazobactam BMD< 0.06- > 640.54134 (97.1)1 (0.7)3 (2.2)
Meropenem GDM0.023- > 324> 3262 (44.9)20 (14.5)56 (40.6)92.96 (4.3)
Meropenem BMD< 0.06- > 324> 3263 (45.7)20 (14.5)55 (39.9)
Doripenem GDM0.004- > 324> 3260 (43.5)25 (18.1)53 (38.4)89.68 (5.8)1 (0.7)
Doripenem BMD< 0.06- > 3243262 (44.9)25 (18.1)51 (37.0)
  1. Range, MIC 50 and MIC 90 are given in mg/mL. GDM = gradient diffusion method, BMD = broth microdilution method. *This was a very major error i.e., susceptible by GDM and resistant by BMD