Chronic granulomatous disease (CGD) is a disorder of neutrophils, where impaired NADPH oxidase activity is caused by a defect in one of the five protein subunits of the NADPH oxidase complex, resulting in failure to kill certain bacteria and fungi. The proteins of the NADPH oxidase complex are encoded by genes CYBB, CYBA, NCF1, NCF2, and NCF4. Genetic counselling and specific prognosis are possible after the detection of the disease-causing mutation.
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