Table 3.
Distribution of Extended-Spectrum β-Lactamase Producers Versus Nonextended-Spectrum β-Lactamase Producers Among the Phylogenetic Groups
| Phylogenetic group | ESBL producers, n (%) | Non-ESBL producers, n (%) | p |
|---|---|---|---|
| A | |||
| Positive | 5 (27.8) | 18 (19.0) | 0.5224 |
| Negative | 13 (72.2) | 77 (81.0) | |
| B1 | |||
| Positive | 2 (18.2) | 22 (20.7) | >0.9999 |
| Negative | 9 (81.8) | 84 (79.3) | |
| B2 | |||
| Positive | 12 (38.7) | 11 (14.7) | 0.0095 |
| Negative | 19 (61.3) | 64 (85.3) | |
| D | |||
| Positive | 3 (10.0) | 20 (23.5) | 0.1826 |
| Negative | 27 (90.0) | 65 (76.5) | |
| F | |||
| Positive | 1 (33.3) | 22 (19.3) | 0.4847 |
| Negative | 2 (66.7) | 92 (80.7) | |
| Ungrouped | |||
| Positive | 1 (50.0) | 22 (19.0) | 0.3532 |
| Negative | 1 (50.0) | 94 (81.0) | |
Isolates in phylogenetic group B2 were more likely to be ESBL producers compared with other phylogenetic groups (p = 0.0095).