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Profound T-cell lymphopenia associated with prenatal exposure to purine antagonists detected by TREC newborn screening

Abstract

Recognition of non-SCID and secondary causes of T cell lymphopenia detected by TREC newborn screening is important in directing subsequent care and identifying those who would not benefit from more invasive interventions. Here, we report two infants with low TRECs and severe, but self-resolving, T cell lymphopenia identified by SCID NBS that were caused by in utero exposure to purine antimetabolites.

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