parameter | baseline values | highest efficacy | lowest efficacy | |
---|---|---|---|---|

p | probability of primary failure | 0.035 | 0.01 | 0.06 |

φ | probability of temporary protection | 0.95 | 1 | 0.9 |

ε | probability of becoming infected if vaccinated | 0.75 | 0.5 | 1 |

b | probability that immunity will be ‘boosted’ if exposed to varicella while vaccine protected | 0.75 | 1 | 0.5 |

ρ | relative infectiousness of breakthrough varicella | 0.6 | 0.2 | 1 |

ψ | waning rate (year^{−1}) | 0.06 | 0.02 | 0.1 |