Table 1.
Epidemiological parameters
| Notation | Description | Selection method | Baseline value (alternative values) | Reference |
|---|---|---|---|---|
| Vaccine coverage | Fixed | 70% (30%, 50%, 100%) | [33–37] | |
| 1/ρV | Mean duration of protection after birth (from vaccination) in days | Calculated based on number of days of mother’s immunity remaining at birth | 90 (182, 230) days. See text for explanation. | [9, 10] |
| 1/ρI | Mean duration of protection after birth (from infection) in days | Calculated based on number of days of mother’s immunity remaining at birth | 90 (182, 230) days. See text for explanation. | |
| aV | Reduced susceptibility to infection in infant from mother having been vaccinated | Fixed + sensitivity analysis | 0.4 (0.2, 0.6) | |
| aI | Reduced susceptibility to infection in infant from mother having been infected | Fixed + sensitivity analysis | 0.4 (0.2, 0.6) | [17] |
| 1/σ | Latent period (days) | Gamma distribution, shape parameter 3 | 4 | [38, 39] |
| 1/γ | Infectious period (days) | Gamma distribution, shape parameter 3 | 9 | [39, 40] |
| 1/νI | Duration of immunity following infection | Gamma distribution, shape parameter 3 | Mean 230 days (182, 364) | [41] |
| 1/νV | Duration of immunity following vaccination | Gamma distribution, shape parameter 3 | Mean 230 days (182, 364) | |
| ω | Reduced infectiousness in individuals aged 10 years and over | Calibration | 0.2 | See text |
| q | Community transmission coefficient | Calibration | 0.015 | See text |
| qh | Household transmission coefficient | Calibration | 2.4 | See text |
| b1 | Amplitude of seasonal forcing | Fixed | 0.397 | [17] |