Impaired chemiluminescence and bactericidal killing by neutrophils from patients with severe cobalamin deficiency

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Abstract
Neutrophil function was examined in 24 patients with megaloblastic hemopoiesis due to vitamin B12-or folate deficiency. Defective bactericidal activity was demonstrated in the B12-deficient group only and was associated with normal phagocytic activity but impaired intracellular killing. Luminol amplified luminescence was consistently low in B12-deficient subjects with RBC [red blood cell] counts of less than 2 .times. 1012/l. These defects were not seen in the folate-deficient cases although isolated abnormalities were present in those who were also alcoholic.