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

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

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter22: Prokaryotes: Bacteria And Archaea

Section: Chapter Questions

Problem 21RQ: A disease that is constantly present in a population iis called _____________. pandemic epidemic...

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