Abstract
To the Editor: Wolf and others1 advocate neonatal screening for biotinidase deficiency. In a feasibility study, we found one infant with a positive test among the 8000 screened. A quantitative plasma assay of biotinidase levels confirmed the result. Levels of biotinidase that were half the normal levels were observed in the mother and in a half-sibling; these findings are consistent with an autosomal recessive inheritance. An examination of the baby at 34 days of age revealed no abnormalities. Biochemical evaluations were normal, as were auditory and visual evoked potentials and an electroretinogram. Treatment was begun with 10 mg of biotin . . .

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