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06.8. In SIR models, what two things drive the transmission rate, [3? 7' The frequency of contact between susceptible and infected individuals and the length of the infectious period 7' The frequency of contact between susceptible and infected individuals and the probability of infection per contact event ' The length of the infectious period and the probability of infection per contact event The number of recovered individuals and the probability of infection per contact event 06.9. Why is it important to "flatten the curve" by reducing the peak number of infections during an epidemic? " Flattening the curve hastens the arrival of herd immunity for the population. Flattening the curve reduces the likelihood of exceeding the health care system's capacity. Flattening the curve eliminates the need for community mitigation strategies like social distancing. ' Flattening the curve reduces the number of people who need to be vaccinated.