A study involved 2,024 malaria-infected cases that compared blood cell parameters found that RBC and Hb counts were significantly reduced in patients with high parasitemia compared to those with low and moderate parasitemia groups (p < 0.05), while MCV and MCH were significantly reduced in patients with moderate parasitemia compared to those with low and high parasitemia groups (p < 0.05) [27]. This evidence concerns the gene GSTM1 and parasitic infectious disease.