Antibiotic Susceptibility Chart Page 3
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4Antimicrobial Drugs: Indications for Use and Resistant Break-
points
Antimicrobial
Indications
Resistance
Drugs*
Breakpoint MIC
(ųg/ml)
≥ 64
Canine and equine
Amikacin
dermal/urinary tract infection
≥ 32
Amoxicillin/ampicillin
Enterobacteriaceae
≥ 0.5
Staphylococci
≥ 16
Enterococci
≥ 8
Streptococci
≥ 4
Listeria monocytogenes
Amoxicillin –clavulanic acid
≥ 8
Staphylococci
≥ 32
Other organisms
≥ 32
Cephalosporins
including
Cephalothin, Cefazolin, Cefotaxime,
Cefoxitin, Ceftazadime and
Cephalexin
≥ 8
Bovine respiratory disease
Ceftiofur
Porcine respiratory disease
Bovine mastitis
Poultry (colibacillosis)
Small animal/equine
Chloramphenicol
≥ 16
Streptococci
≥ 32
Other organisms
Enrofloxacin
Bovine respiratory disease
≥ 2
(beef cattle only)
≥ 4
Small animal
≥ 1
Streptococci
Erythromycin
≥ 8
Other bacteria
≥ 8
Florfenicol
Bovine respiratory disease
Porcine respiratory disease
≥ 8
Gentamicin
Small animal/equine
≥ 16
Imipenem
Small animal/equine
≥ 4
Small animal/porcine
Lincomycin/clindamycin
≥ 4
Marbofloxacin
Small animal dermal/urinary
tract infection
≥ 8
Orbifloxacin
Small animal dermal/urinary
tract infection
Oxacillin including methicillin,
Bovine mastitis/small animal
≥ 4
nafcillin and cloxacillin
S. aureus
≥ 0.5
Staphylococci
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