Table 1.
Prevalence of colistin resistance among Escherichia coli isolates of different origins.
| Animals | Farm number | Samples | Number of isolates | Number of colistin-resistant isolates (%) |
|---|---|---|---|---|
| 2013–2014 | ||||
| Laying hens | 21 | 357 | 295 | 25 (8.5) |
| Broilers | 43 | 886 | 611 | 102 (16.7) |
| Chickens | 6 | 90 | 67 | 9 (13.4) |
| All farm chickens | 47 | 1333 | 973 | 13 (14.0) |
| Chickens at slaughter | 456 | 325 | 31 (9.5) | |
| Piglets | 15 | 275 | 246 | 57 (23.2) |
| Weaned pigs | 12 | 180 | 150 | 97 (64.7) |
| Fattening pigs | 32 | 713 | 664 | 141 (21.2) |
| Sows | 24 | 361 | 332 | 26 (7.8) |
| All farm pigs | 46 | 1529 | 1392 | 335 (24.1) |
| Pigs at slaughter | 1200 | 1063 | 258 (24.3) | |
| Cows | 13 | 370 | 336 | 3 (0.9) |
| Total | 4888 | 4089 | 763 (18.7) | |
| 2007–2008 | ||||
| Farm chickens | 91 | 5 (5.5) | ||
| 2010–2011 | ||||
| Farm chickens | 86 | 10 (11.6) | ||
| Farm pigs | 172 | 22 (12.8) |