Fig. 9

Effects of including waning immunity on symptomatic and asymptomatic infections. Figure shows percent increases in symptomatic and asymptomatic cases at equilibrium after the switch to aP vaccination with inclusion of waning immunity. Parameters: birth rate (μ) = death rate (ν) = 1/75 years ⁻¹; recovery rates for symptomatic (γ _s ) and asymptomatic (γ _a ) = 14 days ⁻¹; probability of symptomatic infection (σ) = 0.25; baseline wP vaccination rate = 0.9; transmissibility (β) is calculated such that R₀=18