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Table 1 Summary of antimicrobials included in the Vitek 2™ AST-GN 98 card and respective breakpoints used

From: Antimicrobial resistance in Escherichia coli isolated from on-farm and conventional hatching broiler farms in Ireland

Antimicrobial Range (mg/L) Breakpoints (mg/L)
   S I R
Amikacin 2 - 64 <=4 8 >=16
Amoxicillin/Clavulanic Acid 2 - 32 <=8   >=16
Ampicillin 2. - 32 <=8   >=16
Cefalexin 4 – 64 <=4   >=8
Ceftiofur 1 – 8 <= 2   >=8
Cefovecin 0.5 - 8 <= 2 4 >=8
Cephalothin 2 - 64 <= 2 4 >=8
Chloramphenicol 2 - 64 <=8 16 >=32
Doxycycline 0.5 - 16 <=4 8 >=16
Enrofloxacin 0.12 – 4 <=0.5 1-2 >=4
Gentamicin 1 – 16 <= 2 4 >=8
Marbofloxacin 0.5 - 4 <=1 2 >= 4
Nitrofurantonin 1 - 16 <=64   >=64
Tetracycline 1 - 16 <=4 8 >=16
Trimethoprim/Sulphamethoxazole 20 – 320 <=40   >=80