Table 3.
Prevalence of plasmid-mediated quinolone resistance (PMQR) genes in different species of quinolone-resistant clinical Shigella isolates
| PMQR |
Shigella sonnei (n = 26) |
Shigella flexneri (n = 16) |
Total (n = 42) |
|||
|---|---|---|---|---|---|---|
| Positive | Negative | Positive | Negative | Positive | Negative | |
| n (%) | n (%) | n (%) | ||||
| qnrA | 5 (19.2) | 21 (80.8) | 9 (56.3) | 7 (43.8) | 14 (33.3) | 28 (66.7) |
| qnrB | 5 (19.2) | 21 (80.8) | 3 (18.8) | 36 (81.3) | 8 (19.0) | 34 (81.0) |
| qnrC | 0 (0.0) | 26 (100.0) | 0 (0.0) | 16 (100.0) | 0 (0.0) | 42 (100.0) |
| qnrD | 0 (0.0) | 26 (100.0) | 0 (0.0) | 16 (100.0) | 0 (0.0) | 42 (100.0) |
| qnrE | 0 (0.0) | 26 (100.0) | 0 (0.0) | 16 (100.0) | 0 (0.0) | 42 (100.0) |
| qnrS | 16 (61.5) | 37 (69.8) | 6 (37.5) | 33 (84.6) | 22 (52.4) | 20 (47.6) |
| qnrVC | 0 (0.0) | 26 (100.0) | 0 (0.0) | 16 (100.0) | 0 (0.0) | 42 (100.0) |
| qepA | 0 (0.0) | 26 (100.0) | 0 (0.0) | 16 (100.0) | 0 (0.0) | 42 (100.0) |
| aac(6′)-Ib-cr | 10 (38.5) | 16 (61.5) | 4 (25.0) | 12 (75.0) | 14 (33.3) | 28 (85.3) |
| oqxAB | 0 (0.0) | 26 (100.0) | 0 (0.0) | 16 (100.0) | 0 (0.0) | 42 (100.0) |
| crpP | 0 (0.0) | 26 (100.0) | 0 (0.0) | 16 (100.0) | 0 (0.0) | 42 (100.0) |
| PMQR co-occurrence |
Shigella sonnei (n = 26) n (%) |
Shigella flexneri (n = 16) n (%) |
Total (n = 42) n (%) |
|---|---|---|---|
| qnrA/aac(6′)-Ib-cr | 2 (7.7) | 2 (12.5) | 4 (9.5) |
| qnrS/aac(6′)-Ib-cr | 4 (15.4) | 2 (7.7) | 6 (14.3) |
| qnrA/qnrS | 1 (3.8) | 1 (6.3) | 2 (4.8) |
| qnrB/qnrS | 1 (3.8) | 1 (6.3) | 2 (4.8) |
| qnrB/aac(6′)-Ib-cr | 1 (3.8) | 0 (0.0) | 1 (2.4) |
| qnrA/qnrS/aac(6′)-Ib-cr | 1 (3.8) | 0 (0.0) | 1 (2.4) |
| qnrB/qnrS/aac(6′)-Ib-cr | 1 (3.8) | 0 (0.0) | 1 (2.4) |