Table 3. Number and proportion of Salmonella isolates resistant to different antimicrobials recovered from swine and cattle samples between 2006 and 2015.
| Antimicrobiala | Swine (n = 2,537) | Cattle (n = 1,167) | ||||
|---|---|---|---|---|---|---|
| Resistant strains | % resistant | 06–15 trend (95% CI)b | Resistant strains | % resistant | 06–15 trend (95% CI)b | |
| Ampicillin (A) | 1771 | 69.8% | -3.26 (-5.5 to -1.0) | 479 | 46.6% | |
| Ceftiofur (C) | 780 | 30.7% | -3.73 (-6.4 to -1.0) | 377 | 36.7% | 6.41 (2.2 to 11.0) |
| Enrofloxacin (E) | 231 | 10.4% | +99.3 (30 to 205) | --- | --- | |
| Florfenicol (F) | 1226 | 48.3% | -6.15 (-8.0 to -4.3) | 441 | 42.9% | 3.99 (-1.2 to 9.4) |
| Gentamicin (G) | 826 | 32.6% | --- | --- | ||
| Neomycin (N) | 978 | 38.5% | 272 | 26.5% | -7.76 (-15.2 to +0.3) | |
| Oxytetracycline (O) | 2253 | 88.8% | -1.35 (-2.2 to -0.5) | 547 | 53.2% | |
| Sulfadimethoxine (Sul) | 2398 | 94.5% | -0.39 (-0.8 to +0.10) | 850 | 82.7% | -1.17 (-2.2 to -0.1) |
| Trimethoprim/ Sulfamethoxazole (Ts) | 838 | 33.0% | 112 | 10.9% | ||
a Spectinomycin was not included due to the availability of an accepted breakpoint for Salmonella
b Annual rate of change in the proportion of resistant isolates for antimicrobials in which a significant trend (chi-square test for trends with p<0.05) was found.