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Table 3 Minimal inhibitory concentration test results for 269 APEC isolates, CLSI (2012)

From: Identification of Escherichia coli from broiler chickens in Jordan, their antimicrobial resistance, gene characterization and the associated risk factors

Antimicrobials Agents Number & (%) of APEC isolates MICa interpretive criteriac
Rb I S R I S
Ceftriaxone 15 (5.5) 8 (2.97) 245 (91) ≥4 2 ≤1
Ceftazidime 21 (7.8) 5 (1.85) 243 (90.3) ≥16 8 ≤4
Gentamicin 160 (59.4) 42 (15.6) 67 (24.9) ≥16 8 ≤4
Ciprofloxacin 178 (66) 11 (4) 80 (29.7) ≥4 2 ≤1
Cephalexin 238 (88.4) 26 (9.66) 5 (1.85) ≤16 8 ≥3
Doxycycline 251 (93.3) 3 (1.1) 15 (5.57) ≤16 8 ≥4
Amoxicillin 254 (94.4) 15 (5.57) 0 (0) ≤32 16 ≥8
Florfenicol 258 (95.9) 11 (4) 0 (0) ≤8 4 ≥2
  1. a MIC: minimal inhibitory concentration of E. coli ATCC 25922, b R: resistant, I: intermediate resistance, S: sensitive. c The MIC interpretive criteria of E. coli ATCC 25922 for Ceftriaxone, Ceftazidime, Gentamicin and Doxycycline is the same value as of breakpoint published by CLSI document M100-S26. CLSI 2017, M100, 27th ed., for ciprofloxacin. For amoxicillin and cephalexin according to EUCAST Clinical Breakpoint Tables v. 8.1, valid from 2018 to 05-15, for Florfenicol according to NCCLS document M7-A3, 1999