G6PD and G6PD deficiency: 54 Widespread screening for the presence of G6PD deficiency is not available in most countries, although rapid diagnostic tests for G6PD are in development.55 To prevent relapse, the WHO recommends treating infection with P. vivax or P. ovale in children and adults (except pregnant women, infants aged <6 months, women breastfeeding infants aged <6 months, women breastfeeding older infants unless they are known not to be G6PD deficient, and people with G6PD deficiency) with a 14-day course of primaquine at 0.25–0.5 mg/kg body weight daily in all transmission settings.