Table 2 The Geometrical Mean Concentration (GMC), with 95% CI, of serum samples from pertussis cases and from internal controls at week 9, 13 and 60 of the epidemic, and of the serum samples from the external controls (n = 4275)
Subjects and time of sampling during the pertussis epidemic | Number of samples | IgA | IgG | ||
|---|---|---|---|---|---|
| Â | Â | GMC | 95% CI | GMC | 95% CI |
Cases (n = 46) | Â | Â | Â | Â | Â |
- week 9 | 43 | 123 | 75 – 202 | 252 | 119 – 535 |
- week 13 | 46 | 172 | 121 – 244 | 355 | 235 – 537 |
- week 60 | 40 | 60 | 40 – 89 | 34 | 22 – 53 |
Internal controls (n = 35) | Â | Â | Â | Â | Â |
- week 9 | 34 | 9.4 | 6.4 – 13.7 | 6.0 | 3.9 – 9.3 |
- week 13 | 34 | 7.8 | 5.2 – 11.6 | 3.8 | 2.4 – 6.1 |
- week 60 | 29 | 6.6 | 4.4 – 9.9 | 2.8 | 1.8 – 4.2 |
- week 9, 13 and 60 combined | 97 | 7.9 | 6.3 – 9.9 | 4.1 | 3.1 – 5.3 |
External controls (n = 4275) | 4275 | 8.5 | 7.9 – 9.1 | 7.4 | 6.7 – 8.3 |