Disease Control in Age Structure Population

Figure 2

A 2 SIRS age groups model: Dynamics due to infection is represented by continuous lines, while that related to demography is shown in dotted lines. 𝑆_𝑖, 𝐼_𝑖, and 𝑅_𝑖 correspond to susceptible, infected and removed states, respectively. Here, we have 𝐵_𝑆=(1−𝜋)𝑏^′𝐼₂+𝑏𝑆₂+𝑏^′′𝑅₂ and 𝐵_𝐼=𝜋𝑏^′𝐼₂.