Table 3.

Percent resistant, MIC₅₀ and MIC₉₀ of canine Staphylococcus pseudintermedius (n = 60)

Class and/or Antimicrobial	Range tested (μg/mL)	Resistance breakpoint (μg/mL)	Resistant strains (%)	MIC50	MIC90
Amoxicillin/Clavulanate	2–16	8	0	2	2
Ampicillin/Sulbactam	4–64	32	0	4	4
Cephalothin	4–64	32	0	4	4
Penicillin	0.06–0.5	0.25	7	0.06	0.12
Ciprofloxacin	0.25–16	4	0	0.25	0.25
Enrofloxacin	0.25–16	4	0	0.25	0.25
Clindamycin	0.25–16	4	8	0.25	1
Erythromycin	0.25–16	8	13	0.25	32
Amikacin	8–64	32	0	8	8
Gentamicin	2–16	8	0	2	2
Chloramphenicol	4–32	32	0	4	4
Rifampin	0.5–8	4	0	0.5	0.5
Tetracycline	2–32	16	34	2	64
Trimethoprim/Sulfamethoxazole	19–76	76	5	19	19