Table 3. The total numbers of the detected genotypes of extended-spectrum cephalosporin-resistant Escherichia coli isolated from wild red foxes in 2016 in Norway (N = 528) from areas with low, medium and high population density isolated using a selective method for detection.
| Resistance genotype | Population density | Total | Conjugative transfer | ||
|---|---|---|---|---|---|
| Low | Medium | High | |||
| blaCMY | 2 | 1 | 3 | 2 | |
| blaCTX-M-1 | 2 | 2 | 2 | ||
| blaCTX-M-14 | 1 | 1 | 0 | ||
| blaCTX-M-15 | 2 | 2 | 4 | 1 | |
| Up-regulated chromosomal ampC | 2 | 4 | 1 | 7 | NA |
| Total | 2 | 10 | 5 | 17 | 5 |
The number of isolates harbouring plasmid-associated resistance genes on conjugative plasmids is indicated in the last column. NA: not applicable