Multiple Choice
In the chain of infection, which component refers to the route that allows the pathogen to enter the host?
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25. Epidemiology
Introduction to Chain of Infection
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In the chain of infection model, which of the following is NOT considered one of the standard links?
A
Portal of entry
B
Reservoir
C
Mode of transmission
D
Incubation period
Verified step by step guidance1
Understand the chain of infection model, which describes the sequence of events that allow an infectious disease to spread from one host to another.
Identify the standard links in the chain of infection, which typically include: Infectious agent, Reservoir, Portal of exit, Mode of transmission, Portal of entry, and Susceptible host.
Recognize that the 'Incubation period' refers to the time between exposure to the infectious agent and the appearance of symptoms, which is a phase in disease progression but not a link in the chain of infection itself.
Compare the given options to the standard links and note that 'Incubation period' is not part of the chain of infection links, while 'Portal of entry', 'Reservoir', and 'Mode of transmission' are standard links.
Conclude that the correct answer is the term that does not fit into the chain of infection model, which is 'Incubation period'.
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