The nurse works with a female client who recently developed an infection of Staphylococcus aureus while in the hospital. In this case, S. aureus is which component in the chain of infection?
A) Host
B) Environmental reservoir
C) Agent
D) Portal
Ans: C
Feedback:
The agent, or the microbe that causes the disease, is the "what" of the epidemiologic triangle. The host, or the organism that is harboring the infectious agent, is the "who" of the triangle. The environment, which includes those external factors that cause or allow disease transmission, is the "where" of the triangle. Other necessary elements include a portal of exit from the host, environmental reservoirs, transmission, and a portal of entry to a new host.
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