Figure 20.5 Comparison of Propagated Versus Common Source Epidemics The graph depicts the number of new cases that develop over a period of days.

called a propagated epidemic (figure 20.5). The first case in such an outbreak is called the index case. In a propagated epidemic, if a direct chain of contacts can be established, the time between the onset of symptoms in one case and the next reflects the incubation period of the disease.

The season of the year in which the epidemic occurs may also be significant. Respiratory diseases including influenza, respiratory syncytial virus infections, and the common cold are more easily transmitted in crowded indoor conditions during the winter (figure 20.6). Conversely, vector- and foodborne

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