U1.5 Flashcards
The Infectious Disease Cycle
Chain of Infection:
- any animate or inanimate object in which an infectious agent is found normally living (i.e., a normal host or habitat)
reservoir
The Infectious Disease Cycle
Chain of Infection:
- Infectious Agent
- Reservoir
- Portal of Exit
- Mode of Transmission
- Portal of Entry
- Susceptible Host
The Infectious Disease Cycle
Chain of Infection: Reservoir:
- is a person harboring a pathogen such as a diseased individual or a carrier.
Human reservoir
The Infectious Disease Cycle
Chain of Infection: Reservoir:
- both wild and domestic animals are living reservoir of microorganisms. Zoonoses (s. zoonosis) are infections indigenous to animals but can be transmitted to humans.
Animal reservoir
The Infectious Disease Cycle
Chain of Infection: Reservoir:
- the two major reservoir of infectious diseases are soil and water. Example, Clostridium tetani spores in soil; organisms causing gastroenteritis in water resulting from fecal contamination.
Non-living reservoir
The Infectious Disease Cycle
Chain of Infection: Reservoir:
The reservoir may or may not be the source from which the infectious agent is transferred to a host. The _____________ is the immediate origin of the infectious agent. It can be either an animate or inanimate object from which a pathogen is immediately transmitted to the host, either directly or indirectly through an intermediate object
source of infectious agent
The Infectious Disease Cycle
Chain of Infection: Reservoir: Infectious agent:
- a source outside the body such as the environment or other person or animal
Exogenous source
The Infectious Disease Cycle
Chain of Infection: Reservoir: Infectious agent:
- already existing within the body such as an endogenous bacteria. Disease may be bought on by bacteria “from within” such as the normal flora of the organism from a latent infection.
Endogenous source
