CD8A and infection: Before challenge infection with RSV, we also examined the effector CD4 and CD8 T cell responses upon in vitro stimulation of various RSV specific peptides (F51-66, G183-195 as CD4 T cell epitope, F85-93 and M282-90 as CD8 T cell epitope) to better understand the effector T cell responses (Fig 8E–8J).