. Poisons, bacterial invasions, and allergies are examples of A. Types of direct causes of structural and/or functional changes B. Toxins that seriously damage vital organs C. Predisposing causes of disease D. Agents that interfere with cell division.

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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.