Multiple Choice
The natural habitat or most common host for a pathogen or disease is called a pathogen’s __________.
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25. Epidemiology
Introduction to Chain of Infection
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In the chain of infection, what is the first link (i.e., the chain of infection starts with which component)?
A
Infectious agent (pathogen)
B
Mode of transmission
C
Portal of entry
D
Susceptible host
Verified step by step guidance1
Understand that the chain of infection describes the sequence of events that allows an infection to spread from one host to another.
Identify the components of 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 chain always begins with the infectious agent, which is the pathogen (such as bacteria, virus, or fungus) that causes the disease.
Note that without the presence of the infectious agent, the infection cannot start or be transmitted.
Therefore, the first link in the chain of infection is the infectious agent (pathogen).
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