Table 2.
Summary of E. coli isolates with blaCTX-M recovered from the fecal flora of Ohio dairy cattle including specific CTX-M gene, additional β-lactamase genes carried by the isolates, plasmid incompatibility group, and replicon type of additional plasmids
| Herd | No. of isolates | CTX-M gene type | Additional β-lactamase | CTX-M plasmida | Additional plasmid(s) |
|---|---|---|---|---|---|
| 5 | 24 | CTX-M-15 | I1 | F | |
| 6 | CTX-M-15 | TEM–1 | I1 | F | |
| 6 | 4 | CTX-M-14 | F | ||
| 2 | CTX-M-14 | * | |||
| 7 | 1 | CTX-M-14 | F | ||
| 17 | 6 | CTX-M-1 | CMY–2 | N | |
| 1 | CTX-M-1 | N | A/C | ||
| 19 | 6 | CTX-M-1 | N | Y | |
| 6 | CTX-M-1 | TEM–1 | N | Y | |
| 7 | CTX–M-1 | N | |||
| 6 | CTX-M-1 | N | FIB | ||
| 1 | CTX-M-1 | * |
a
*, plasmid could not be typed using our incompatibility group typing procedure.