TABLE 3.
Distribution of predominant resistance patterns among major serovars
| Resistance patterna | No. (%) of isolates of the following serovars with the resistance pattern:
|
|||||
|---|---|---|---|---|---|---|
| All isolates | Copenhagen | Typhimurium | Derby | Heidelberg | All other serovars | |
| No resistance | 177 (14.1) | 10 (2.4) | 4 (2.3) | 33 (10.9) | 1 (1.1) | 129 (47.8) |
| Te alone | 455 (36.2) | 21 (5.0) | 3 (1.7) | 230 (75.7) | 81 (91.0) | 120 (44.4) |
| AmTe | 91 (7.2) | 21 (5.0) | 69 (39.0) | 1 (0.3) | 0 | 0 |
| AmPiTe | 63 (5.0) | 10 (2.4) | 51 (28.8) | 0 | 0 | 2 (0.7) |
| AmAxPiTe | 36 (2.9) | 9 (2.2) | 22 (12.4) | 0 | 0 | 5 (1.8) |
| AmAxCmPiTe | 324 (25.8) | 319 (76.5) | 2 (1.1) | 1 (0.3) | 2 (2.2) | 0 |
| All MDR patternsb | 625 (49.7) | 386 (92.6) | 170 (96) | 41 (13.5) | 7 (7.9) | 21 (7.8) |
a
Am, ampicillin; Ax; amoxicillin-clavulanic acid; Cm, chloramphenicol; Pi, piperacillin; Te, tetracycline.
b
MDR is defined as resistance to two or more of the antimicrobials tested.