Table 1.

Criteria for hypersensitivity^†

Category A	Hypersensitivity/anaphylactic symptoms/allergic reactions/drug allergy
Category B	Cases meeting the following two or more items:
	• Rash
	• Fever
	• Gastrointestinal symptoms (nausea, vomiting, diarrhoea and abdominal pain)
	• Constitutional symptoms (coma, fatigue, malaise, myalgia and abnormal chest radiographs [infiltration is mainly noted and may be localized in some cases])
Exclusion criteria	• A patient in whom other causes are highly probable despite the presence of hypersensitivity-like symptoms
	• A patient without recurrence after readministration of abacavir
	• A patient with disappearance of symptoms during treatment with abacavir
	• A patient who does not meet the criteria for category B despite suspected hypersensitivity to abacavir

^†Patients who meet the criteria for category A or B but not the exclusion criteria are determined to have hypersensitivity to abacavir.