2. a) Describe what is happening to a host during each of the periods of disease shown in the graph below. Number of pathogen particles (red) incubation prodromal period period Periods of Disease period of illness Time period of decline period of convalescence Severity of symptoms (blue) b) The above graph is very similar to the bacterial growth curve. Identify and describe the major difference in what's represented by the two graphs.

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Pathogenicity

Infection and Transmission

The infections are generated by the pathogenic organisms present in the environment. They maintain the capacity to invade a host body and establish colonies. A disease caused by such infectious agents is called a communicable disease or transmissible disease. These diseases spread through diverse means including blood, food, water, air, or vectors.