Table 2. Details of case-patients followed up through enhanced pertussis surveillance, England and Wales, 2002–2009.
| Variable | No. (%) case-patients, by age group* |
||||
|---|---|---|---|---|---|
| <1 y, n = 1,185† | 1–4 y, n = 190‡ | 5–9 y, n = 225§ | 10–14 y, n = 498¶ | >15 y, n = 1,781# | |
| No. vaccine doses administered before symptom onset | |||||
| 0 | 840 (77) | 76 (44) | 51 (24) | 38 (8) | 652 (59) |
| 1 | 196 (18) | 9 (5) | 8 (4) | 6 (1) | 24 (2) |
| 2 | 36 (3) | 1 (1) | 4 (2) | 7 (1) | 26 (2) |
| 3 | 24 (2) | 85 (49) | 98 (47) | 419 (86) | 396 (36) |
| 4 | 0 | 3 (2) | 48 (23) | 15 (3) | 0 |
| Total hospitalized | 927 (90) | 66 (42) | 35 (19) | 44 (10) | 81 (5) |
| Any complications** | |||||
| Yes | 394 (39) | 30 (19) | 22 (12) | 29 (7) | 176 (11) |
| Yes, excluding apnea in those >1 y old | 394 (39) | 11 (8) | 19 (11) | 18 (4) | 69 (5) |
*Proportions are based on total cases where these details were provided. †Median age at onset 53 d; 48% male. ‡Median age at onset 2.5 y; 42% male. §Median age at onset 7.8 y; 50% male. ¶Median age at onset 12.5 y; 49%male. #Median age at onset 41.8 y; 44% male. **Specifically reported pneumonia, convulsion, apnea, conjunctival hemorrhage, or death.