T-Cell Receptor Excision Circles in HIV-Exposed, Uninfected Newborns Measured During a National Newborn Screening Program for Severe Combined Immunodeficiency.

Severe combined immunodeficiency screening by measuring T-receptor excision circles at birth allows evaluation of the impact of various maternal conditions on newborn immunity. The slight decrease observed in a French cohort of newborns to HIV-infected mothers can be explained by the confounding factors of prematurity and African descent.