Age-stratified epidemic dynamics with POLYMOD-style contact matrices. Different age groups have different contact rates and infection fatality ratios. Explore how vaccination strategies reshape outcomes.
R₀ (basic reproduction number)2.5
Incubation period (days)5
Infectious period (days)7
Contact matrix pattern
Vaccination coverage by age group
0-19: 0%
20-39: 0%
40-59: 0%
60+: 0%
Model: SEIRD with 4 age groups. Force of infection λᵢ = Σⱼ βᵢⱼ Iⱼ/Nⱼ using contact matrix C. IFR by age: 0-19: 0.002%, 20-39: 0.05%, 40-59: 0.3%, 60+: 2.0% Population shares: 0-19: 25%, 20-39: 30%, 40-59: 25%, 60+: 20% Vaccination removes susceptibles at start; effective R₀ reduced proportionally.