The nurse's stethoscope most correctly represents which possible link in the chain of infection?
a. Source
b. Portal of exit
c. Portal of entry
d. Mode of transmission
ANS: D
The stethoscope would be a means for the pathogen to travel from source to host. The source is the reservoir or host. The portal of exit is where the pathogen escapes from the reservoir of infection, and the portal of entry is where the microorganism enters the susceptible host.
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