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d Kanifukuoka-Kyodo Clinic, Fujimino, Japan Abstract Helicobacter pylori infection has been reported to be inversely associated with allergic disorders. We by chance experienced a patient with atrophic gastritis who presented marked elevations of both nonspecific serum immunoglobulin E and eosinophil counts after H. pylori eradication. A 49-year-old Japanese man received eradication of H. pylori using lansoprazole 60 mg/day, amoxicillin 1,500 mg/day, and clarithromycin 400 mg/day for 7 days. Serum immunoglobulin E increased to more than four times its pretreatment level, 306 ) 485 ) 1,325 U/ml, and peripheral eosinophil counts increased to more than three times, 99 ) 139 ) 298 per μl. Deducing from the current case, H. pylori eradication might develop allergic disorders in some patients.