A patient has been taking cephalexin (Keflex) for an upper respiratory infection. On the seventh day of treatment, the patient develops myalgia and fever. What reaction is the patient likely having?
A) The patient has developed a new infection.
B) The patient has developed an autoimmune disease.
C) The patient has become septic.
D) The patient has serum sickness.
D
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Serum sickness is a delayed hypersensitivity reaction most often caused by drugs, such as antimicrobials. Within initial exposure to the antigen, symptoms usually develop within 7 to 10 days and include urticaria, lymphadenopathy, myalgia, arthralgia, and fever. Although the patient has a fever, the patient does not present with all the symptoms of a new infection or sepsis. An autoimmune disease is not likely.
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