객관식
In the chain of infection (infectious agent, reservoir, portal of exit, mode of transmission, portal of entry, susceptible host), which link is generally considered the easiest to break to prevent disease spread?
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25. Epidemiology
Introduction to Chain of Infection
Multiple Choice
In the chain of infection model, which sequence of events correctly describes how an infection occurs?
A
Reservoir → infectious agent → susceptible host → mode of transmission → portal of exit → portal of entry
B
Infectious agent → reservoir → portal of exit → mode of transmission → portal of entry → susceptible host
C
Mode of transmission → reservoir → portal of entry → portal of exit → susceptible host → infectious agent
D
Susceptible host → portal of entry → portal of exit → reservoir → infectious agent → mode of transmission
검증된 단계별 안내1
Step 1: Understand the components of the chain of infection. The chain includes: infectious agent, reservoir, portal of exit, mode of transmission, portal of entry, and susceptible host.
Step 2: Recognize the correct order in which an infection occurs. It starts with the infectious agent (the pathogen causing disease).
Step 3: The infectious agent must have a reservoir, which is the natural habitat where it lives and multiplies (e.g., humans, animals, environment).
Step 4: The infectious agent leaves the reservoir through a portal of exit (such as respiratory secretions, blood, or skin).
Step 5: The agent is then transmitted via a mode of transmission (direct contact, airborne, vector-borne, etc.) to enter a new host through a portal of entry (like mucous membranes or broken skin), finally reaching a susceptible host who can become infected.
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