Spatial SIR Epidemic
Click the grid to seed infection — watch wavefronts spread
Susceptible
Infected
Recovered
Click to seed infection
β (transmission):
0.30
γ (recovery):
0.05
R₀ = β/γ:
6.0
Reset (all susceptible)
Random 30% vaccinated
Spatial SIR model
Each cell: S→I with rate β per infected neighbor, I→R with rate γ.
Wave speed ∝ √(β·D) where D is diffusion. Above epidemic threshold R₀>1 waves propagate; vaccination reduces effective R₀.
Click
on grid to seed infection anywhere.