Six links in chain of infection
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Portal of entry
Fifth stage; route through is the pathogen enters it's new host. It could inhale it, ingest it, or sexual contact
Infectious agent
First stage; pathogen
Route of transmission
Fourth stage; Method by with pathogen gets from reservoir to new host from touching the air
Reservoir host
Second stage; place or host where the pathogen lives/resides
Susceptible host
Sixth stage;Organism that excepts pathogen; back to beginning
Portal of exit
Third stage; route of escape of the pathogen from the reservoir