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| Parameter | Description | Value |
|---|---|---|
| p | Proportion that loses antibodies after primary infection. | 0 or 1 |
| δ | Rate of loss of antibodies post primary infection | 4/person/year [15, 17] |
| σ | Rate of loss of maternal antibodies | Fitted |
| λ0 | Rate of primary infection (primary force of infection) | Fitted |
| λ1 | Rate of secondary infection (secondary force of infection) | Fitted |
