Table 3.
Comparison of yersiniabactin prevalence among invasive isolates according to β-lactam resistance pattern
| Antibiotic resistance pattern | No. (%) of isolates PCR positive for Ybt |
|---|---|
| Enhanced β-lactam resistance | |
| KPC (n = 11) | 7 (64) |
| ESBL (n = 6) | 2 (33) |
| Other (n = 4) | 0 (0) |
| Combined (n = 21) | 9 (43) |
| Classical (n = 68) | 7 (10) |
| Total (n = 89) | 16 (18) |
| P valuea | 0.0019 |
| Relative risk (95% CI) | 3.4 (1.74-6.72) |
a
Calculated using Fisher's exact test to compare prevalence among resistant (combined) and nonresistant (classical) isolates.