Laboratory data showed mild anemia (hemoglobin [Hb]: 11.8± 0.7 g/dl), high eosinophilia (41.1 ± 15.7%), high alanine transaminase (ALT) and aspartate transaminase (AST) levels, and a positive serological titer (936.1±387.2). The gene discussed is GSTM1; the disease is anemia.