7 4 Contagion Models 2 SIS Model

"the SIS model, for "susceptible, infected and then susceptible". That is, you're susceptible to some disease, then you get infected, and then after you get infected you're cured, but then you can become susceptible again if the disease is mutated in some way, like a flu virus. There's also something called the SIR model, where after you become infected then you're recovered, then there's no chance of getting the disease again. "- Transcript from Scott Page Coursera

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