GSTM1 and parasitic infectious disease: According to the WHO, the criteria for diagnosing severe malaria among children (< 12 years) was assessed using Hb < 5 g/dL and among other patients ≥ 12 years, Hb < 7 g/dL with parasitemia > 10,000/μL, plasma bilirubin > 50 μmol/L amidst parasitemia > 100,000/μL and P. falciparum hyperparasitaemia (> 500,000 parasites/μL).