Table 4.

Vaccine efficacy parameter values. Sources: Brisson et al. [14,15], Chaves et al. [26] and Seward et al. [27].

parameterbaseline valueshighest efficacylowest efficacy
pprobability of primary failure0.0350.010.06
φprobability of temporary protection0.9510.9
εprobability of becoming infected if vaccinated0.750.51
bprobability that immunity will be ‘boosted’ if exposed to varicella while vaccine protected0.7510.5
ρrelative infectiousness of breakthrough varicella0.60.21
ψwaning rate (year−1)0.060.020.1