GSTM1 and parasitic infectious disease: However, in uncomplicated P. falciparum, positive correlations were obtained between S1P levels and parasitemia (rs = 0.389; p = 0.034), Hb (rs = 0.387; p = 0.034) and Hct (rs = 0.402; p = 0.028) (Fig 3E–3H).