TABLE 1.
Strains used in this study and Southern hybridization data with various probes
| Strain | Serovar | Resistance phenotypea | Genomic island name | Size(s) (kb) of XbaI fragment(s) hybridizingb with:
|
Reference | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| aadA2 | floR | tet(G) | pse-1 | qac/sul1 | tnpA/S044 | p1-9 | |||||
| 96-5227 | DT104 | ACSSuT | SGI1 | 11.7 | 11.7 | 11.7 | 11.7, 4.3 | 11.7, 4.3 | 4.3 | 9.0, 4.1 | 29 |
| 959SA97 | Agona | ACSSuT | SGI1 | 11.7 | 11.7 | 11.7 | 11.7, 4.3 | 11.7, 4.3 | 4.3 | 9.0, 4.1 | 10 |
| 1169SA97 | Agona | ACSSuTTm | SGI1-A | 11.7 | 11.7 | 11.7 | 11.7, 8.8 | 11.7, 8.8 | 8.8 | 9.0, 4.1 | 4 |
| S/960725 | DT104 | ASu | SGI1-B | — | — | — | 2.5, 4.3 | 4.3 | 4.3 | 9.0, 4.1 | 4 |
| 0047SA97 | Agona | SSu | SGI1-C | 6.6 | — | — | — | 6.6 | 6.6 | 9.0, 4.1 | This study |
| S/954435 | DT104 | SSu | SGI1-C | 6.6 | — | — | — | 6.6 | 6.6 | 9.0, 4.1 | 4 |
| 953SA98 | Agona | ASSuTmc | SGI1-D | ND | ND | ND | ND | ND | ND | ND | This study |
| S/960081 | DT104 | ASSuT | SGI1-E | 9.1 | 9.1, 7.9 | 9.1 | 9.1, 7.9 | 9.1 | 9.1, 7.9 | 9.0, 4.1 | 4 |
a
A, ampicillin; C, chloramphenicol (and flofenicol); S, spectinomycin and streptomycin; Su, sulfonamides; T, tetracycline; Tm, trimethoprim.
b
—, no hybridization signal observed; ND, not done.
c
Ampicillin resistance is due to the presence of a TEM β-lactamase.