Although it has been hypothesized that analgesic idiosyncrasy could be acquired by viral infection, there is no evidence that any virus can cause sporadic cases of aspirin-intolerant asthma. We report a case, which points to the possible relevance of herpes simplex virus (HSV) infection for development of analgesic idiosyncrasy. We examined the patient to evaluate whether analgesic idiosyncrasy might have been acquired by viral infection. Sulpyrine provocation testing was performed to confirm the patient’s development of analgesic idiosyncrasy and methacholine provocation testing was performed to assess bronchial hyperresponsiveness. The titer of anti-HSV IgG antibody was measured to confirm viral infection. Sulpyrine provocation testing revealed that hypersensitivity to analgesics had appeared in this patient. In contrast, the marked improvement of her bronchial hyperresponsiveness was confirmed by a PC20 methacholine of 0.63 mg/ml 1 week after sulpyrine provocation testing. The anti-HSV IgG antibody confirmed recent HSV infection. To the best of our knowledge, this is the first reported case of acquired analgesic idiosyncrasy following HSV infection.

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