Table 4.
Proportion of macrolide and tetracycline resistance genes detected in 1071 isolates of Group B streptococci within capsular types.
| CPS type | No. of isolates | No. of MR isolates | Macrolide resistance genes N (%) |
No. of TR isolates | Tetracycline resistance genes N (%) |
||||
|---|---|---|---|---|---|---|---|---|---|
| ermA | ermB | mefA | tetM | tetO | tetL | ||||
| Ia | 149 | 29 (19.5) | 5 (3.4) | 10(6.7) | 20 (13.4) | 134 (90) | 134 (90) | – | – |
| Ib | 118 | 18 (15.3) | 2 (1.6) | 16 (13.5) | 2 (1.6) | 92 (78) | 69 (58.5) | 23 (19.5) | – |
| II | 191 | 48 (25.1) | 5 (2.6) | 39 (20.4) | 6 (3.2) | 170 (89) | 111 (58.1) | 59 (30.9) | – |
| III | 276 | 67 (24.3) | 10 (3.6) | 45 (16.3) | 22 (7.8) | 224 (81.2) | 153 (55.4) | 70 (25.4) | 1 (0.4) |
| IV | 59 | 20 (33.9) | 4 (6.8) | 17 (28.8) | – | 55 (93.2) | 40 (67.8) | 15 (25.4) | – |
| V | 278 | 104 (37.4) | 20 (7.2) | 81 (29.1) | 6 (2.2) | 238 (85.6) | 210 (75.5) | 27 (9.7) | – |
CPS capsular polysaccharide, MR macrolide resistance, TR tetracycline resistance.