Multiple Choice
In the chain of infection model, which sequence of events correctly describes how an infectious disease is transmitted and leads to infection in a new host?
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25. Epidemiology
Introduction to Chain of Infection
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The natural habitat or most common host for a pathogen or disease is called a pathogen’s __________.
A
Portal of entry.
B
Susceptible host.
C
Reservoir.
D
Primary inhabitance.
Verified step by step guidance1
Understand the key terms related to pathogen transmission and infection: 'portal of entry' refers to the site through which a pathogen enters the host; 'susceptible host' is an organism vulnerable to infection; 'reservoir' is the natural habitat where the pathogen normally lives and multiplies; 'primary inhabitance' is not a standard microbiology term.
Identify the definition of 'reservoir' in microbiology: it is the natural environment or host in which a pathogen normally lives, grows, and multiplies, serving as a source of infection.
Compare the options given with the definition of 'reservoir' to determine which best fits the description of the natural habitat or most common host for a pathogen.
Recognize that 'portal of entry' and 'susceptible host' describe different aspects of infection and do not refer to the pathogen's natural habitat.
Conclude that the correct term for the natural habitat or most common host of a pathogen is 'reservoir'.
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