TABLE 1.
Source, antibiograms, antibiotic resistance genes, and plasmid profiles of Canadian Salmonella serovar Typhimurium DT104 isolates
| Source | Total no. of isolates | Antibiograma | Genotype identified | Plasmid size profile (MDa) |
|---|---|---|---|---|
| Human | 6 | ACSSuTr | pse1 pasppflo-likecaadA2 sulI tet(G) | 60 |
| 3 | ACSSuT-KANr | pse1 aadA2 sulI tet(G) aphA-1 | 60, 2.0 | |
| 1 | ACSuTr | pse1 sulI tet(G) | 60 | |
| 1 | SSuTr | tet(A) | 60 | |
| 3 | T-KANr | tet(B) aphA-1 | 60 | |
| 6 | Susceptibleb | 60 | ||
| 1 | Susceptibleb | 60, 2.2, 1.4 | ||
| Nonhuman | 2 | ACSSuTr | pse1 aadA2 sulI tet(G) | 60 |
| 1 | ACSSuT-KANr | pse1 aadA2 sulI tet(G) aphA-1 | 60, 2.0 | |
| 5 | ACSuTr | pse1 sulI tet(G) | 60 | |
| 2 | Susceptibleb | 60 | ||
| Unknown | 14d | ASSu-TMPr | NAf | 60, 50, 4.6, 3.7 |
| 16e | ASSu-KANr | sulI aphA-1 | 60, 3.4, 2.3, 2.0, 1.4 |
a
TMPr, trimethoprim resistant.
b
Susceptible to all antibiotics tested.
c
Putative chloramphenicol resistance determinant (2, 5), identified in strain 96-5227 by the PCR method.
d
A phage-type-atypical (AT) isolate containing TMP resistance on a self-transmissible 4.6-MDa plasmid was used as a control for the mating experiment.
e
Phage type PT120.
f
NA, unable to be determined in this study.