Table 1.
Characteristics of blaCTX-M-55 gene-harboring Salmonella isolates.
| Strains | Serotype | Year | Sources | Cephalosporins resistance characterization |
Quinolone resistance characterization |
|||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MICCTX | β-lactamase genes | blaCTX-M-55 location | MICCIP | PMQR genes | Mutations in GyrA/GyrB | Mutations in ParC/ParE | MLST | |||||
| HZP3 | Typhimurium | 2016 | pork | 128 | blaCTX-M-55 blaTEM-1 | chromosome | 1 | oqxAB+qnrS | –/– | –/– | ND | |
| LWP4 | Typhimurium | 2016 | pork | 128 | blaCTX-M-55 blaTEM-1 blaOXA-1 | chromosome | 0.5 | qnrS | –/– | –/– | ST34 | |
| OJM1 | Indiana | 2017 | Chicken meat | 256 | blaCTX-M-55 blaOXA-1 | chromosome | 64 | aac(6’)-Ib-cr+oqxAB | S83F D87N/– | T57S S80R/– | ST17 | |
| PJM1 | ND | 2017 | Chicken meat | 128 | blaCTX-M-55 blaTEM-1 blaOXA-1 | chromosome | 4 | qnrS | –/– | T57S/– | ST321 | |
| OYM4 | Indiana | 2017 | duck | 256 | blaCTX-M-55 blaOXA-1 | chromosome | 64 | aac(6’)-Ib-cr+oqxAB | S83F D87N/– | T57S S80R/– | ST17 | |
| OYM6 | Indiana | 2017 | duck | 256 | blaCTX-M-55 blaOXA-1 | chromosome | 64 | aac(6’)-Ib-cr+oqxAB | S83F D87N/– | T57S S80R/– | ST17 | |
| OYM8 | Indiana | 2017 | duck | 256 | blaCTX-M-55 blaOXA-1 | chromosome | 64 | aac(6’)-Ib-cr+oqxAB | S83F D87N/– | T57S S80R/– | ST17 | |
| OYM9 | Indiana | 2017 | duck | 256 | blaCTX-M-55 blaOXA-1 | chromosome | 64 | aac(6’)-Ib-cr+oqxAB | S83F D87N/– | T57S S80R/– | ST17 | |
| OYM10 | Chester | 2017 | duck | 256 | blaCTX-M-55 blaOXA-1 | chromosome | 64 | – | D87N/– | T57S S80R/– | ST343 | |
| OYM13 | Indiana | 2017 | duck | 256 | blaCTX-M-55 blaOXA-1 | chromosome | 64 | aac(6’)-Ib-cr+oqxAB | S83F D87N/– | T57S S80R/– | ST17 | |
| OYZ3 | Indiana | 2017 | duck | 256 | blaCTX-M-55 blaOXA-1 | chromosome | 64 | aac(6’)-Ib-cr+oqxAB | S83F D87N/– | T57S S80R/– | ST17 | |
| OYZ4 | Chester | 2017 | duck | 128 | blaCTX-M-55 blaTEM-1 blaOXA-1 | plasmid | 4 | qnrS | –/– | –/– | ST27 | |
ND, not determined.