Glucose-6-phosphate dehydrogenase (G6PD) deficiency is one of the most common enzymopathies in humans, present in approximately half a billion people worldwide, with a predominance in sub-Saharan Africa, the Arabian Peninsula, and South Asia, where it confers a survival advantage to Plasmodium falciparum infections1. The gene discussed is G6PD; the disease is G6PD deficiency.