Genotypically defined G6PDd and CYP2D6 genotypes were not factors in the initial absolute fall in falciparum-infected Tanzanian patients (median age 6.4 years), who were treated with SLDPQ [56], and α-thalassaemia genotype was not a factor in the D7 fractional fall in Hb in Tanzanian children (median age 4 years) [34]. Here, CYP2D6 is linked to thalassemia.