Table 2.
Distribution of β-lactamase genes among ceftiofur-resistant E. coli isolatesa
| Sample source (n) | No. of isolates carrying: |
||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Any blaCTX-M | blaCTX-M-27 | blaCTX-M-55 | blaCTX-M-24e | blaCTX-M-105 | blaCTX-M-14a | blaCTX-M-14b | blaCTX-M-24a | blaCTX-M-24b | blaSHV-12 | blaCMY-2 | blaDHA-1 | blaTEM-1 | |
| FW (32) | 26 | 8 | 7 | 10 | 2 | 3 | 0 | 0 | 1 | 2 | 1 | 21 | |
| TW (12) | 12 | 3 | 2 | 2 | 4 | 1 | 0 | 1 | 0 | 1 | 7 | ||
| HD (40) | 24 | 7 | 9 | 5 | 4 | 3 | 0 | 0 | 0 | 2 | 16 | ||
| RD (70) | 36 | 13 | 5 | 1 | 8 | 5 | 3 | 1 | 0 | 3 | 5 | 1 | 22 |
| DD (27) | 3 | 0 | 3 | 2 | 1 | 0 | 0 | 0 | 0 | 1 | |||
| EV (7) | 7 | 3 | 1 | 2 | 1 | 0 | 0 | 1 | 0 | 0 | |||
| Total (123) | 108 | 34 | 27 | 22 | 20 | 12 | 3 | 3 | 1 | 5 | 9 | 1 | 67 |
a
FW, 1-week-old duck; TW, 3-week-old duck; HD, 7-week-old duck; RD, 10-week-old duck; DD, 22-week-old duck; EV, pool water.