Table 2 Clindamycin and erythromycin resistance among invasive (Wisconsin 1998–2002) and colonizing (Michigan 2001) group B streptococcal isolates by capsular type
From: Frequency of antimicrobial resistance among invasive and colonizing Group B Streptococcal isolates
Invasive isolates (n= 486) | ||||
|---|---|---|---|---|
Capsular type | No. of strains | Clindamycin resistance only no. (%) | Erythromycin resistance only no. (%) | Resistance to both no. (%) |
Ia | 118 | 0 | 14 (11.9) | 4 (3.4) |
Ib | 54 | 0 | 0 | 8 (14.8) |
II | 65 | 0 | 3 (4.6) | 7 (10.8) |
III | 62 | 1 (1.6) | 2 (3.2) | 5 (8.1) |
IV | 1 | 0 | 0 | 0 |
V | 180 | 0 | 4 (2.2) | 71 (39.4) |
VI | 0 | 0 | 0 | 0 |
VII | 0 | 0 | 0 | 0 |
VIII | 0 | 0 | 0 | 0 |
NT | 3 | 0 | 0 | 1 (20.0) |
VT | 3 | 0 | 0 | 0 |
Total | 486 | 1 (0.2) | 23 (4.7) | 96 (19.8) |
Colonizing isolates ( n = 167) | ||||
Capsular type | No. of strains | Clindamycin resistance only no. (%) | Erythromycin resistance only no. (%) | Resistance to both no. (%) |
Ia | 31 | 2 (6.5) | 3 (9.7) | 7 (22.6)1 |
Ib | 23 | 0 | 1 (4.4) | 2 (8.7) |
II | 18 | 0 | 0 | 6 (33.3)1 |
III | 22 | 2 (9.1) | 0 | 6 (27.3)1 |
IV | 2 | 0 | 0 | 2 (100) |
V | 60 | 0 | 1 (1.7) | 38 (63.3)1 |
VI | 0 | 0 | 0 | 0 |
VII | 0 | 0 | 0 | 0 |
VIII | 1 | 0 | 0 | 0 |
NT | 10 | 0 | 1 (10.0) | 3 (30.0) |
VT | 0 | 0 | 0 | 0 |
Total | 167 | 4 (2.4) | 6 (3.6) | 64 (38.3) |