This report examines an unusual case of Srongyloides stercoralis hyperinfection in a 63-yr-old man. The patient had a history of vitamin B deficiency, on and off diarrhea, and clinical pellagra for a decade and a half. There was also evidence of extreme eosinophilia. The patient did not have any associated illness suggestive of immunosuppression. Treatment with ivermectin resulted in remarkable clinical improvement and reversion of eosinophil count to normal.

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