Table 2.
Distribution of capsular polysaccharide types and hypervirulent clone III/ST17 among 1071 invasive and non-invasive isolates of Group B streptococci within different patient groups.
| Patient group | Invasive GBS isolates: N (%) | Non-invasive GBS isolates: N (%) | ||||||
|---|---|---|---|---|---|---|---|---|
| CPS type | EOD | LOD | Adults | ∑ | Pregnant women—asymptomatic colonisation | Non-pregnant adults—urogenital infections | ∑ | |
| Ia | 6 (14.6) | – | 1 (5) | 7 (8.8) | 128 (14.6) | 14 (12.3) | 142 (14.3) | |
| Ib | 4 (9.8) | 1 (5.3) | 2 (10) | 7 (8.8) | 96 (10.9) | 15 (13.2) | 111 (11.2) | |
| II | 3 (7.3) | – | – | 3 (3.8) | 175 (20) | 13 (11.4) | 188 (19) | |
| III/non-ST17 | 3 (7.3) | 7 (36.8) | 3 (15) | 13 (16.3) | 110 (12.5) | 17 (14.9) | 127 (12.8) | |
| III/ST17 | 16 (39) | 9 (47.4) | 3 (15) | 28 (35) | 99 (11.3) | 9 (7.9) | 108 (10.9) | |
| IV | 1 (2.4) | 1 (5.3) | 3 (15) | 5 (6.3) | 45 (5.1) | 9 (7.9) | 54 (5.4) | |
| V | 8 (19.5) | 1 (5.3) | 8 (40) | 17 (21.3) | 224 (25.5) | 37 (32.5) | 261 (26.3) | |
| ∑ | 41 (100) | 19 (100) | 20 (100) | 80 (100) | 877 (100) | 114 (100) | 991 (100) | |
CPS capsular polysaccharide, EOD early-onset disease, LOD late-onset disease, GBS Group B streptococcus.