A unit secretary is the only staff member of the emergency department who does not contract a viral upper respiratory illness during a recent outbreak. How would the nurse explain this phenomenon?
A) The secretary had been exposed before and responded with secondary immunity.
B) The secretary has immune tolerance.
C) The secretary's immune system is unable to differentiate self from non-self.
D) The secretary's immune system overproduces plasma cells.
Correct Answer:
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