Neang is a 40-year-old mother feeding her infant at a referral hospital in Pailin, Cambodia, near the Thai border. The child was considered severely ill and admitted with a diagnosis of Plasmodium vivax malaria. This species is an especially difficult problem for pregnant/lactating women and infants because they cannot consume primaquine to kill dormant forms called hypnozoites that cause multiple renewed clinical attacks in the months following infection by a mosquito bite.