Readmission 14 days later with an anemia (Hb 7.7 g/dL) and associated reticulocytopenia of 7.0 × 109/L (20–60 × 109/L) prompted a provisional diagnosis of transient erythroblastopenia of childhood (TEC), which was made after infection, HIV, and tuberculosis were excluded. The gene discussed is GSTM1; the disease is Reticulocytopenia.