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Severe malaria and glucose-6-phosphate-dehydrogenase deficiency: a reappraisal of the malaria/G-6-P.D. hypothesis.

Nigerian children with convulsions and Plasmodium falciparium parasitaemia above 100,000/microliter did not show a decreased frequency of glucose-6-phosphate-dehydrogenase (G.-6-P.D.) deficiency. A re-evaluation of earlier studies has led to the conclusion that clinical evidence of protection against falciparum malaria in G.-6-P.D.-deficient individuals is lacking. Evidence for the possible role of malaria in selecting for G.-6-P.D.-deficient genes consists solely of the geographical association of high frequencies of G.-6-P.D. deficiency with endemic malaria.