TABLE 1.
Pneumococcal serotype distribution and isolate transmission category in mother–infant pairs (pneumococcal 13-valent conjugate vaccine serotypes plus 6C and non-typeable (NT))
| Serotype | Total, N | Transmitteda, N (% within serotype) | PI-1 present, N (% within serotype) |
|---|---|---|---|
| 1 | 12 | 4 (33.3) | 0 (0.00) |
| 3 | 11 | 4 (36.4) | 0 (0.00) |
| 4 | 4 | 2 (50.0) | 0 (0.00) |
| 5 | 10 | 2 (20.0) | 0 (0.00) |
| 6A | 16 | 6 (37.5) | 0 (0.00) |
| 6B | 54 | 27 (50.0) | 29 (53.7) |
| 6C | 15 | 4 (26.7) | 0 (0.00) |
| 7F | 5 | 2 (40.0) | 0 (0.00) |
| 9V | 8 | 4 (50.0) | 5 (62.5) |
| 14 | 46 | 28 (60.9) | 15 (32.6) |
| 18C | 7 | 4 (57.1) | 0 (0.00) |
| 19F | 89 | 50 (56.2) | 81 (91.0) |
| 19A | 14 | 4 (28.6) | 1 (7.1) |
| 23F | 82 | 38 (46.3) | 63 (76.8) |
| NT | 110 | 57 (51.8) | 25 (22.7) |
| Total | 483 | 236 (48.9) | 219 (45.3) |
PI-1, pilus islet-1.
a
Concordant and discordant transmission combined.