TABLE 4.
Overview of the integron-positive Shiga toxin–producing Escherichia coli strains.
| Strain | Serogroup | Virulence profile stx1/2 gene | Integron int gene | Antibiotic resistance profile |
MDR | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AM | C | CFM | E | ENR | P | SXT | TET | |||||
| PNU1 | Non-157 | 1 | + | R | S | S | R | S | R | R | R | + |
| PNU2 | Non-157 | 2 | + | S | S | S | R | S | R | R | R | + |
| PNU3 | Non-157 | 2 | + | R | R | S | R | R | S | R | R | + |
| PNU4 | Non-157 | 2 | + | R | R | S | R | R | R | R | R | + |
| PNU5 | Non-157 | 2 | + | R | S | S | R | S | R | S | R | + |
| PNU7 | Non-157 | 1 | + | R | S | R | R | S | R | S | R | + |
| PNU10 | Non-157 | 1 | + | R | S | R | R | S | R | S | R | + |
| PNU20 | O157 | 1, 2 | + | R | S | R | R | S | R | S | R | + |
| PNU21 | O157 | 1, 2 | + | R | S | R | R | S | R | S | R | + |
| PNU24 | O157 | 1, 2 | + | R | S | S | R | S | R | S | R | + |
| PNU26 | O157 | 1, 2 | + | S | S | S | R | S | R | S | S | - |
| PNU30 | Non-157 | 2 | + | R | R | S | R | R | R | R | R | + |
| PNU31 | Non-157 | 2 | + | R | R | S | R | R | R | R | R | + |
| PNU33 | Non-157 | 1 | + | R | R | S | R | R | R | R | R | + |
| PNU34 | Non-157 | 2 | + | S | R | S | R | S | R | R | R | + |
| PNU35 | Non-157 | 2 | + | R | S | R | R | S | R | S | R | + |
| PNU39 | Non-157 | 2 | + | S | R | S | R | S | R | R | R | + |
| PNU40 | Non-157 | 1 | + | R | S | S | R | R | R | R | R | + |
| PNU50 | Non-157 | 1 | + | R | R | S | R | R | R | R | R | + |
| PNU51 | Non-157 | 2 | + | R | R | R | R | S | R | R | R | + |
| PNU58 | Non-157 | 2 | + | R | S | S | R | S | R | R | R | + |
| PNU61 | Non-157 | 2 | + | R | R | S | R | S | R | R | R | + |
| PNU62 | Non-157 | 2 | + | R | S | S | R | S | R | R | R | + |
Note: Antibiotic resistance profile was determined for eight antibiotics: ampicillin (AM), tetracycline (TET), erythromycin (E), enrofloxacin (ENR), trimethoprim/sulfamethoxazole (SXT), chloramphenicol (C), penicillin (P) and cefixime (CFM).
stx, isolates carrying stx1 and/or stx2 genes; MDR, multidrug-resistant isolates; S, antibiotic-susceptible isolates; R, antibiotic-resistant isolates.
+, positive for int gene or MDR.