The most popular model to model epidemics is the so-called SIR model – or Kermack-McKendrick. Consider a population of size , and assume that is the number of susceptible, the number of infectious, and for the number recovered (or immune) individuals, so that which implies that . In order to be more realistic, consider some (constant) birth rate , so that the model becomesNote, in this model, that people get sick (infected) but they do not die, they recover. So here, we can model … Continue reading <span …