Answer:
2. Portal of exit provides a way for a microorganism to leave the reservoir. For example, the microorganism may leave the reservoir through the nose or mouth when someone sneezes or coughs.
3. Route of transmission in the mode of transmission is the method by which the organism moves from one host to another. The mode of transmission is contact, droplet, air-borne, foodborne/water-borne, Vector-borne (usually insect).
4. Portal of entry are membranes, or breaks in the skin. Tubes placed in body cavities, such as urinary catheters, or from punctures produced by invasive procedures such as intravenous fluid replacement can also serve as portal of entry.
5. Prions are organisms that are considered intermediate, that is, somewhere between a virus and a bacterium.