CYP2D6 and Plasmodium vivax malaria: Although the outcome of this study suggests that the CYP2D6 status in ADF personnel was not the determining factor for relapsing vivax malaria, it does not rule out that CYP2D6 status will affect efficacy of PART in future military operations, especially in individuals having a CYP2D6 diplotype with both non-function alleles.