There are six links in the chain of infection:
1. The etiologic agent, or micro organism:
2. The reservoir, the place where the organism naturally resides.
3. Portal of exist from reservoir
4. Method of Transmission
5. Portal of entry in to the host
6. Susceptibility of the host
Infectious agent (pathogenic, Reservoir. Portal of exit from, Vehicle means of, Portal(s) of entry, Susceptible host
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