20 Average -incubation period Index Time case (a) Propagated Epidemic 20 • Minimum incubation period Average incubation period - Maximum incubation period Time Exposure (b) Common-Source Epidemic FIGURE 19.9 Comparison of Propagated Versus Common- Source Epidemics (a) The time between the index case and subsequent cases reflects the average incubation period of the disease. As the disease is propagated, this interval is blurred. (b) Cases in a common-source epidemic appear only within the incubation period. Number of cases Number of cases 15

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