The WHO, groups, the G6PD Orissa variant into a kind of “moderately deficient” (Class III) associated with symptomatic haemolysis on exposure to certain drugs and infectious agents, and G6PD Mediterranean “severely deficient” (Class II) associated with drugs induced haemolytic anaemia (DIHA), favism and neonatal jaundice. The gene discussed is G6PD; the disease is non-autoimmune hemolytic anemia.