G6PD and malaria: Among malaria-negative samples, 6 samples with impaired G6PD activity were subjected to DNA sequencing and four single nucleotide substitutions were identified; namely, G6PD Kaiping (c.1388G>A), G6PD Vanua Lava (c.383T>C), G6PD Gond (c.477G>C), and a combination of intron 7 mutation (c.771-39C>T), c.1311C>T, and c.1365-13T>C.