Which person is most at risk for a hypersensitivity reaction?
a. 26-year-old receiving his second desensitization injection
b. 35-year-old starting back on birth control tablets
c. The 52-year-old started on a new series of Pyridium for cystitis
d. The 84-year-old receiving penicillin for an annually recurring respiratory infection
ANS: D
The 84-year-old with the deteriorated immune system is a prime candidate for a delayed hypersensitivity reaction.
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