CCR4 and infection: On days 1 and 2 post-infection the Th1 associated C-X-C motif chemokine receptor (CXCR)3 ligand CXCL10/IP-10 (Fig 2A) and the Th2 associated C-C motif chemokine receptor (CCR)4 ligands CCL22/MDC (Fig 2B) and CCL17/TARC (Fig 2C) in bronchoalveolar lavage (BAL) were similarly induced in RV infected Tbet-/- and w/t mice compared to the respective PBS challenged controls.