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Age range (month) of positive pertussis cases.
| Age (month) | Total number of specimens | Number of pertussis cases | ||
|---|---|---|---|---|
| Culture only | End-point PCR only | Culture and end- point PCR | ||
| <1 | 37 | 0 | 13 | 0 |
| 1–3 | 431 | 4 | 189 | 6 |
| 4–6 | 105 | 0 | 20 | 0 |
| 7–9 | 38 | 0 | 7 | 0 |
| 10–12 | 32 | 0 | 10 | 0 |
| 13–15 | 7 | 0 | 4 | 0 |
| 16–18 | 9 | 0 | 3 | 0 |
| 19–21 | 7 | 0 | 1 | 0 |
| 22–24 | 8 | 0 | 4 | 0 |
| >24 | 33 | 0 | 14 | 0 |
