Table 4 Frequency of genes encoding the alpha (bca) and beta (bac) C proteins, and the protein Rib (rib) among invasive versus colonizing group B streptococcal isolates by serotype.
| Â | Invasive n (%) | Colonizing n (%) | ||||
|---|---|---|---|---|---|---|
| Â | bca | bac | rib | bca | bac | rib |
Overall freq. | 29/100 (29) | 20/100 (20) | 28/100 (28) | 167/360 (46)* | 82/360 (23) | 72/360 (20)†|
By Serotype | Â | Â | Â | Â | Â | Â |
Ia | 0/33 (0) | 0/43 (0) | 0/33 (0) | 18/71 (25)* | 6/71 (8)†| 1/71 (1) |
Ib | 12/12 (100) | 11/12 (92) | 0/12 (0) | 29/42 (69)* | 32/42 (76) | 3/42 (7) |
II | 8/15 (53) | 2/15 (13) | 5/15 (33) | 25/45 (56) | 10/45 (22) | 15/45 (33) |
III | 0/23 (0) | 6/23 (26) | 23/23 (100) | 5/44 (11)†| 4/44 (9)†| 39/44 (89)†|
IV | 0/0 (0) | 0/0 (0) | 0/0 (0) | 1/2 (50) | 1/2 (50) | 0/2 (0) |
V | 8/15 (53) | 1/15 (7) | 0/15 (0) | 51/76 (67) | 10/78 (13) | 6/78 (8) |
VI | 0/0 (0) | 0/1 (0) | 0/0 (0) | 5/6 (83) | 0/6 (0) | 0/0 (0) |
VIII | 0/0 (0) | 0/0 (0) | 0/0 (0) | 1/1 (100) | 1/1 (100) | 0/0 (0) |
NT | 0/0 (0) | 0/10 (0) | 0/0 (0) | 23/41 (56) | 13/41 (32) | 5/41 (12) |