Table 5.

Proportion of cattle Salmonella spp. isolates resistant to selected antimicrobials in the AHL and CIPARS (C) datasets (May 2007 to December 2013).

	Ampicillin		Sulfisoxazole		Kanamycina		Trim/Sulfa		Tetracycline		Ceftiofur
Year	AHL	C	AHL	C	AHL	C	AHL	C	AHL	C	AHL	C
2007	0.1071	0.2140	0.1429	0.2070	1.0000b	0.1290	0.0357	0.0210	0.1607	0.2430	0.0357	0.0210
2008	0.2593	0.3280	0.2933	0.3430	1.0000b	0.2390	0.0617	0.0670	0.2716	0.3280	0.0617	0.0450
2009	0.4048	0.5650	0.4048	0.5500	1.0000b	0.3820	0.0476	0.0760	0.3810	0.5110	0.0714	0.0760
2010	0.5294	0.5105	0.6000	0.5594	1.0000b	0.4476	0.0294	0.0839	0.5000	0.5455	0.0588	0.1818
2011	0.4211b	0.5847	0.3929b	0.6356	1.0000b	0.3644	0.0175	0.0678	0.3333b	0.6102	0.0351	0.1186
2012	0.2222b	0.5030	0.2639b	0.5820	1.0000b	0.2600	0.0833	0.0400	0.2778b	0.5990	0.0972b	0.2660
2013	0.1385b	0.6130	0.1538b	0.6610	1.0000b	0.2220	0.0615	0.0560	0.1538b	0.6450	0.0615b	0.4270

^aCIPARS reports in vitro susceptibility results for aminoglycosides, while the AHL reports them as resistant based on clinical effectiveness.

^bIndicates a significant difference by the Z-test (P < 0.05).