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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)
  1. 1: Significantly different (P < .05) from the value for invasive isolates.