CD4 and infection: The PVG response to virus/allergen coexposure was characterized by early peaks in plasmacytoid dendritic cell (pDC) influx in the airway draining lymph node, and transient increases in type 2 innate lymphoid cells (ILC2), neutrophils and CD4- conventional dendritic cells (cDCs) which all peaked at day two post-infection in the airway draining lymph node and/or lung (Figures 5, S6).