TABLE 3.
PCR detection of Ampr and Tetr determinants in isolates from periods A and Ha
| Phenotype tested and allele(s) | No. of isolates
|
|||||
|---|---|---|---|---|---|---|
| Ampr (n = 19)
|
Tetr (n = 116)
|
Ampr Tetr (n = 105)
|
||||
| Period A (n = 19) | Period H (n = 0) | Period A (n = 78) | Period H (n = 38) | Period A (n = 23) | Period H (n = 82) | |
| Ampr | ||||||
| blaPSE1 | 5 | 0 | NAd | NA | 4 | 27 |
| blaOXA1 | 0 | 0 | NA | NA | 0 | 0 |
| blaTEM1 | 14 | 0 | NA | NA | 19 | 55 |
| Tetr | ||||||
| tet(A)b | NA | NA | 35 | 14 | 7 | 34 |
| tet(B)b | NA | NA | 15 | 7 | 4 | 13 |
| tet(C)b | NA | NA | 8 | 5 | 3 | 9 |
| tet(A) tet(B)c | NA | NA | 9 | 5 | 4 | 11 |
| tet(B) tet(C)c | NA | NA | 5 | 5 | 2 | 4 |
| tet(A) tet(C)c | NA | NA | 6 | 2 | 3 | 11 |
a
Isolates that displayed Ampr, Tetr, or Ampr Tetr dual resistance upon susceptibility testing were selected for resistance allele characterization.
b
Single resistance.
c
Dual resistance.
d
NA, not applicable.