22 Baird Baird ,  J.K. J.K. ,  Battle Battle ,  K.E. K.E.  &  Howes Howes ,  R.E. R.E. Primaquine ineligibility in anti‐relapse therapy of Plasmodium vivax malaria: the problem of G6PD deficiency and cytochrome P‐450 2D6 polymorphisms Primaquine ineligibility in anti‐relapse therapy of Plasmodium vivax malaria: the problem of G6PD deficiency and cytochrome P‐450 2D6 polymorphisms . The gene discussed is CYP2D6; the disease is G6PD deficiency.