Table 3. Frequency of phenotypical resistance in different bacterial strains isolated from the auditory canal of cattle with or without bovine otitis: susceptible samples (−), sensitivity test not recommended with such antimicrobial (NR), amikacin (AMI), amoxicillin (AMO), ampicillin (AMP), cefoxitin (CFO), cefepime (CFM), cefazolin (CFZ), cefuroxime (CRX), ceftriaxone (CRO), chloramphenicol (CLO), erythromycin (ERI), gentamicin (GEN), meropenem (MER), norfloxacin (NOR), sulfamethoxazole + trimethoprim (SUT), and tetracycline (TET). White background (infected) and gray background (noninfected).

Species/strains (n=20)	Antimicrobials
	AMI	AMO	AMP	CFO	CFM	CFZ	CRX	CRO	CLO	ERI	GEN	MER	NOR	SUT	TET
Escherichia coli	_	50% (1/2)	50% (1/2)	_	_	_	_	_	50% (1/2)	NR	_	_	50% (1/2)	_	NR
10% (2/20)
Citrobacter koseri	_	66.6% (2/3)	66.6% (2/3)	100% (3/3)	66.6% (2/3)	100% (3/3)	100% (3/3)	66.6% (2/3)	33.3% (1/3)	NR	_	_	33.3% (1/3)	_	NR
15% (3/20)
Morganella morgani	_	66.6% (2/3)	66.6% (2/3)	33.3% (1/3)	33.3% (1/3)	66.6% (2/3)	33.3% (1/3)	33.3% (1/3)	33.3% (1/3)	NR	_	_	_	_	NR
15% (3/20)
Serratia marcescens	_	50% (2/4)	50% (2/4)	-	_	100% (4/4)	75% (3/4)	_	_	NR	_	_	_	_	NR
20% (4/20)
Staphylococcus cohni	_	_	_	_	_	_	_	_	_	_	_	_	_	_	_
5% (1/20)
Staphylococcus chromogenes	_	50% (1/2)	50% (1/2)	_	_	_	_	_	50% (1/2)	100% (2/2)	_	_	_	_	50% (1/2)
10% (2/20)
Staphylococcus chromogenes	_	_	_	_	_	_	_	_	_	_	_	_	_	_	_
5% (1/20)
Staphylococcus saprophyticus	_	_	_	_	_	_	_	_	_	_	_	_	_	_	_
5% (1/20)
Bacilus pumilus	_	_	_	_	_	_	_	_	_	_	_	_	_	_	_
5% (1/20)
Arthrobacter arilaitensis	_	_	_	_	_	_	_	_	_	_	_	_	100% (1/1)	_	_
5% (1/20)
Arthrobacter gandavensis	_	_	_	_	_	_	_	_	_	_	_	_	100% (1/1)	_	_
5% (1/20)