Which characterizes the rate of infection between susceptible and infected individuals in an S-I-R model?

Question

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In an S-I-R model, the rate of infection between susceptible and infected individuals is characterized by the formula g × I × S, where g is the rate of infection transmission. This formula describes that the number of new infections (I) is proportional to the number of susceptibles (S) and the rate of infection transmission (g). Therefore, a higher value of g or a larger product of I and S will increase the rate of infection in the population.

Which Characterizes the Rate of Infection Between Susceptible and Infected