TABLE 5.

Distribution of resistant isolates by antibiotic classes and serovars (%).

Class	Antibiotic	S. Kentucky		S. Infantis		S. Enteritidis		S. Typhimurium
		Organic (n = 29)	Non-organic (n = 71)	Organic (n = 25)	Non-organic (n = 48)	Organic (n = 0)	Non-organic (n = 13)	Organic (n = 8)	Non-organic (n = 3)
Aminoglycoside	Amikacin	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
	Gentamicin	0.0	0.0	24.0	8.3	0.0	7.7	87.5a	0.0b
	Tobramycin	0.0	2.8	88.0a	37.5b	0.0	0.0	0.0	0.0
β-lactam/β-lactamase inhibitor combination	Piperacillin/tazobactam constant	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
	Ceftolozane-tazobactam	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
	Ampicillin-sulbactam	3.4b	22.5a	20.0	12.5	0.0	0.0	0.0	0.0
	Ceftazidime-avibactam	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Fluoroquinolone	Levofloxacin	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
	Ciprofloxacin	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Carbapenem	Doripenem	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
	Ertapenem	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
	Imipenem	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
	Meropenem	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Folate pathway inhibitor	Trimethoprim/ sulfamethoxazole	0.0	0.0	28.0	20.8	0.0	0.0	0.0	0.0
Cephem	Cefepime	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
	Ceftazidime	0.0	14.1	0.0	0.0	0.0	0.0	0.0	0.0
	Ceftriaxone	0.0b	19.7a	72.0a	35.4b	0.0	7.7	0.0	33.3
	Cefazolin	24.1	38.0	68.0	52.1	0.0	7.7	12.5b	100.0a
Penicillins	Ampicillin	10.3b	31.0a	68.0a	39.6b	0.0	7.7	12.5b	100.0a
Tetracycline	Tetracycline	100.0	94.4	100.0	97.9	0.0	15.4	100.0	100.0
	Minocycline	89.7	93.0	4.0	14.6	0.0	0.0	12.5	0.0
Monobactams	Aztreonam	0.0	2.8	20.0	16.7	0.0	0.0	0.0	0.0
Nitrofurantoin	Nitrofurantoin	10.3	5.6	100.0	93.8	0.0	15.4	37.5	0.0
Glycylcycline	Tigecycline	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Percentages for organic vs. non-organic, by antibiotic and serovar, with different lowercase letters (a, b) are significantly different (p < 0.05). Serovars with a prevalence below the 5% threshold were not included in this table.