Can you flatten the illustrative curve?
Spread and recovery compete as people move between susceptible, infectious and removed groups.
Inside this model
A closed population starts 99% susceptible and 1% infectious. Each discrete day, new infections are βSI and recoveries are γI, with fractions of the whole population; values are clamped to available compartments. The plot runs 80 days.
Out in the world
A practical use
Understand why the same starting cases can produce different trajectories under different contact assumptions.
A useful lens. Not a universal law.
- No age structure, immunity loss, births, geography or behavior changes; this is educational and not a health forecast.
Associated thinkers
Further reading
Explore the original research or the teaching reference behind this experiment.
Kermack–McKendrick epidemic model — mathematical review ↗