Fig 7. Pathogen reduction across different host lifespans.

Level of pathogen reduction achieved across various times of vaccination with different average host lifespans indicated by the different colors. Solid lines represent the level of pathogen reduction achieved for a given date of vaccine introduction. Dashed lines and the grey region beneath them represent the birthing season. Day 1 corresponds to the first day of the birthing season as well as the first possible day of vaccine introduction. The remaining parameters are: an average population size of 2000 individuals ($\overline{N}=2000$), s = 3, R_0,V = 1.5, R_0,P = 2, 250 vaccines are distributed each year (N_V = 250), individuals can disseminate vaccine for 21 days on average (γ_V and γ_g = 21⁻¹), individuals remain infectious with the pathogen for 21 days on average (γ_P = 21⁻¹), the transferable vaccine is groomed off individuals after 6 days on average (α = 1/15000, and the pathogen is non-virulent (ν = 0).