The chain of infection is commonly described as having six links. These links represent the steps involved in the transmission of infectious diseases:
- Infectious Agent - The pathogen that causes the disease (bacteria, virus, fungus, parasite).
- Reservoir - The natural habitat of the infectious agent (humans, animals, environment).
- Portal of Exit - The route by which the infectious agent leaves the reservoir (e.g., respiratory tract, blood).
- Mode of Transmission - The way the infectious agent is spread (direct contact, airborne, vector-borne).
- Portal of Entry - The way the infectious agent enters a new host (e.g., mucous membranes, breaks in the skin).
- Susceptible Host - An individual who is at risk of infection due to various factors (age, health status, etc.).
So the correct response is Six.
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