1. Institut Imagine, Laboratory of Intestinal Immunity, INSERM UMR1163; Institut Necker Enfants Malades, Laboratory of Host-Microbiota Interaction, INSERM U1151; and Université Paris Descartes-Sorbonne, 75006 Paris, France
2. Institut Pasteur, Unité de Pathogénie Microbienne Moléculaire, INSERM U1202, and College de France, Paris, France