In the context of the classic SI, SIS, and SIR epidemiological models, which of the following statements is incorrect?
A. All three models predict that the epidemic ends only after every individual has been infected at least once.
B. In the Susceptible-Infected (SI) model, each individual in the population is assumed to be either healthy or infected.
C. In the Susceptible-Infected-Susceptible (SIS) model, an individual who becomes infected with the disease can recover and return to the susceptible state, allowing reinfection.
D. In the Susceptible-Infected-Recovered (SIR) model, individuals who have been infected acquire immunity or die from the disease and therefore do not become susceptible again.
E. None of the above
Original idea by: Mylena Roberta
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