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NIH Module 7 – Laboratory Testing, Diagnostic Imaging, And Screening Practice Test

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A reservoir host in the cycle of infection refers to what?
Correct Answer:
An organism that harbors the pathogen and serves as a source.
Explanation:
A reservoir host is the organism that harbors the pathogen and serves as a source for transmission. This means the pathogen can persist in that host, sometimes without causing illness, and be passed on to others, helping sustain the infectious cycle. It isn’t about someone who never carries pathogens, nor about the environment itself or a protective immune barrier. The environment can harbor pathogens, but a reservoir host specifically refers to the living organism that maintains and spreads the pathogen to other hosts. Examples include wildlife or domestic animals that carry a pathogen and shed it to humans or other animals.

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