Case 1: Abacavir Hypersensitivity Reaction

Question | Discussion | References | CME Credit

You answered:

	The onset of symptoms three weeks after initiating antiretroviral therapy makes abacavir hypersensitivity unlikely because the hypersensitivity reaction is usually characterized by an immediate-type reaction occurring within 12 hours of taking the initial dose of abacavir.

This answer is incorrect. The median time to onset of symptoms with abacavir hypersensitivity is 8-11 days with 94% of cases occurring within the first 6 weeks of therapy. Therefore, the timing in this patient is within the typical range for development of abacavir hypersensitivity.

Choose another answer:

	Rash alone is sufficient to diagnose abacavir hypersensitivity, and abacavir should have been stopped with the initial onset of the rash.
	The presence of multiple organ system involvement increases the likelihood that abacavir hypersensitivity is occurring in this individual.
	This patient is experiencing an abacavir hypersensitivity reaction and should receive therapy with corticosteroids.
	This patient should be diagnosed with abacavir hypersensitivity reaction and should have his medication discontinued. Once his symptoms have resolved, it is safe to rechallenge the patient with a lower dose of abacavir.

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