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A 10-month-old girl has had two mild ear infections and is otherwise thriving. Her blood count at 2 months of age was normal. Twice-weekly counts over 6 weeks show an absolute neutrophil count between 0.2 and 0.5 × 10^3/µL [0.2-0.5 × 10^9/L] (reference for age 1.0-8.5 × 10^3/µL), with a mild monocytosis and normal hemoglobin and platelet counts. The marrow is normocellular, with myeloid cells maturing normally through the metamyelocyte stage but few segmented neutrophils, and there is no arrest at the promyelocyte stage. Granulocyte antibody testing detects anti-HNA-1a. The most likely diagnosis is:
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