After a challenge with corticosteroid, increments in the absolute neutrophil count were > 50% in eight healthy black children with neutropenia, and > 2.0 x 10(9)/L (> 2000/mm3) in all but one child. Decrements in the absolute lymphocyte count mirrored the increments. Stimulation with hydrocortisone may be useful in characterizing ethnic neutropenia.

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