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Table 3 Phenotypical and genotypical susceptibility profiles of five E. coli clones, each representing an outbreak.

From: Recurring outbreaks by the same Escherichia coli ST10 clone in a broiler unit during 18 months

Antimicrobial Strain DH68 DH95 DH119
4
DH155 DH162 Resistance
Case 1 2   6 7 Phenotype
Amikacin MIC (mg/L) ≤ 4 ≤ 4 8 8 ≤ 4 Sensitive
Genotype
Amoxicillin/clavulanic acid MIC 8 > 8 8 8 8 Sensitive
Genotype blaTEM-1B blaTEM-1B blaTEM-1B blaTEM-1B blaTEM-1B
Ampicillin MIC > 8 > 8 > 8 > 8 > 8 Resistant
Genotype blaTEM-1B blaTEM-1B blaTEM-1B blaTEM-1B blaTEM-1B
Cefalexin MIC 4 8 4 4 4 Sensitive
Genotype
Cefazolin MIC 4 4 4 4 4 Intermediate
Genotype
Cefovecin MIC 0.5 1 0.25 0.25 0.5 Sensitive
Genotype
Cefpodoxime MIC ≤ 1 ≤ 1 ≤ 1 ≤ 1 ≤ 1 Sensitive
Genotype
Ceftazidime MIC ≤ 4 ≤ 4 ≤ 4 ≤ 4 ≤ 4 Sensitive
Genotype
Chloramphenicol MIC 4 32 8 4 4 Sensitive/resistant
Genotype floR
Doxycycline MIC > 8 > 8 > 8 > 8 > 8 Resistant
Genotype tetA tetA tetA tetA tetA
Enrofloxacin MIC ≤ 0.12 ≤ 0.12 ≤ 0.12 ≤ 0.12 ≤ 0.12 Sensitive
Genotype
Gentamicin MIC 1 1 1 1 1 Sensitive
Genotype
Imipenem MIC ≤ 1 ≤ 1 ≤ 1 ≤ 1 ≤ 1 Sensitive
Genotype
Marbofloxacin MIC ≤ 0.12 ≤ 0.12 ≤ 0.12 ≤ 0.12 ≤ 0.12 Sensitive
Genotype
Orbifloxacin MIC ≤ 1 ≤ 1 ≤ 1 ≤ 1 ≤ 1 Sensitive
Genotype
Piperacillin/tazobactam MIC ≤ 8 ≤ 8 ≤ 8 ≤ 8 ≤ 8 Sensitive
Genotype blaTEM-1B blaTEM-1B blaTEM-1B blaTEM-1B blaTEM-1B
Pradofloxacin MIC ≤ 0.25 ≤ 0.25 ≤ 0.25 ≤ 0.25 ≤ 0.25 Sensitive
Genotype
Tetracycline MIC > 16 > 16 > 16 > 16 > 16 Resistant
Genotype tetA tetA tetA tetA tetA
Trimethoprim/sulfamethoxazole MIC > 4 > 4 > 4 > 4 > 4 Resistant
Genotype dfrA1/sul2 dfrA1/sul2 dfrA1/sul2 dfrA1/sul2 dfrA1/sul2