Answer all the questions. 1. Enumerate and briefly explain the steps in pathogenesis of infectious diseases using an example (Ex: Pathogenesis of COVID-19)  2. Why infection does not always occur?

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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.