Expanded memory CD4+ T Cells in the fetal and the infant Gut; a mucosal route for mother-to-child transmission of HIV-1 by Bunders MJ, van der Loos C, Klarenbeek PL, van Hamme J, Wilde J, de Vries N, van Lier RA, Kootstra N, Pals ST, Kuijpers TW