If a microorganism cannot be cultivated into pure culture, how will its pathogenicity be established in a host? (KOCH'S POSTULATE) a. What are the general factors that must interplay for disease to develop? b. Why are koch's postulate not useful in determining etiology of a viral

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A:

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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.