Antimicrobial resistance in Escherichia coli from Swedish piglets with diarrhoea and associations with potential risk factors

Table 5 Occurrence of antimicrobial resistance in E. Coli in relation to high dose zinc oxide supplementation

	High dose zinc oxide in feed
	Never	> 1 year ago	Ongoing	Overall
Number of herds	31	16	36	83
Number of isolates	50	26	59	135
Proportion of isolates with resistance to:
Ampicillin	24%	42%	27%	29%
Streptomycin	32%	46%	39%	38%
Tetracycline	10%	31%	19%	18%
Trimethoprim-sulphonamide	26%	42%	29%	30%

Proportion of E. coli isolates resistant to ampicillin, streptomycin, tetracycline, and trimethoprim-sulphonamide from pigs in herds that: never; >1 year ago; or ongoing were using zinc oxide. No significant association between AMR and use of hight dose zinc oxide supplementation was observed (P > 0.05)

ISSN: 1751-0147