Pre-treatment severe anaemia (<7 g/dL) was reported for 42 (0·7%) of 5712 patients: 32 (0·8%) of 3776 were G6PD normal, four (0·3%) of 1522 were G6PD intermediate, and six (1·4%) of 414 were G6PD deficient. The gene discussed is G6PD; the disease is anemia (phenotype).