Table 1.

Antimicrobial susceptibility testing.

Antimicrobial agent	P. GXYX	A. GXYX
Microdilution method	MIC (μg/mL)
Gentamicin	R	R
Sulfisoxazole	R	R
Doxycycline	R	S
Chloramphenicol	R	S
Colistin	2048	32
Kirby–Bauer agar diffusion method	Inhibition zone diameter (mm)
Ampicillin (10 μg)	0	26
Ceftiofur (30 μg)	0	0
Cefquinome (30 μg)	0	0
Gentamicin (10 μg)	0	0
Neomycin (30 μg)	10	14
Kanamycin (30 μg)	0	0
Spectinomycin (100 μg)	4	5
Sulfisoxazole (300 μg)	0	0
Trimethoprim–Sulfamethoxazole (1.25/23.75 μg)	0	0
Doxycycline (30 μg)	0	17
Enrofloxacin (10 μg)	0	14
Chloramphenicol (30 μg)	0	25
Florfenicol (30 μg)	0	27
Tilmicosin (15 μg)	0	0
Tiamulin (30 μg)	0	0

^aR, Resistant was designated using suggested MIC breakpoints (gentamicin, ≥ 16 μg/ml; sulfisoxazole, ≥ 512 μg/ml; doxycycline, ≥ 16 μg/ml; chloramphenicol, ≥32 μg/ml) from CLSI reference for non-Enterobacteriaceae.

^bS, Susceptible was designated using suggested MIC breakpoints (doxycycline, ≤ 4 μg/ml; chloramphenicol, ≤ 8 μg/ml) from CLSI reference for non-Enterobacteriaceae.