Final answer:
A reservoir is where conditions are ideal for pathogen replication and transmission. The pathogen exits the reservoir through a portal of exit to infect a new host.
Explanation:
The place where conditions are ripe for replication is known as a reservoir. This is the natural site where a pathogen resides and can be picked up to infect a new host. Pathogens must leave the reservoir through a portal of exit to be transmitted to a new host.
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