Here we begin with the SIR model, the foundation of infectious disease dynamics. Even a single initial case can be sufficient to trigger a chain of transmission. The red surge reflects new infections, rising to a pronounced peak. In parallel, the green curve falls sharply as the susceptible pool is consumed. Eventually, the blue trajectory of recoveries dominates, shaping the system’s final state. With an R-nought of roughly 2.2, such a powerful wave is precisely what the mathematics predicts. In Explore Mode, you may examine how public health interventions influence the effective reproduction number and, under favourable conditions, bring it below unity, while medical interventions that shorten the duration of illness can shift the timing and intensity of the wave. Challenge Mode then presents tasks designed to test your understanding.
