Children with microscopic parasitemia had significantly (P = 0.0036) lower baseline hemoglobin (Hb) levels (mean [standard deviation], 10.5 [1.7] g/dl) than those with submicroscopic (11.3 [1.6] g/dl) or no P. falciparum infection (11.3 [1.5] g/dl) (Table 1). The gene discussed is GSTM1; the disease is parasitic infectious disease.