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Chain of Infection

The vocabulary for the six chain links of infection.

TermDefinition
The Chain of Infection All six links connected/present for an infection to occur.
First Link: The Infectious Agent A pathogen. (disease causing microorganism)
Second Link: The Reservoir Host Where the germ lives or can survive.
Third Link: The Portal of Exit How the pathogen can or has exited the body. (Respiratory secretions, blood, feces)
Fourth Link: The Route of Transmission How the pathogen travels to a new person. (direct contact, or the air)
Fifth Link: The Portal of Entry How the pathogen enter the new host. (ex. cut or ingested)
Sixth Link: The Susceptible Host An organisms capability of becoming infected by the pathogen.
Carrier Hosts Hosts that don't show any outward signs or symptoms of a disease but are still capable of transmitting disease.
Created by: Mikayla112