CD8A and infection: 1° M OT-I CD8 T cells (4x104 cells/recipient; Thy1.1) were transferred into naïve B6 (Thy1.2) recipient mice on the same day (‘early’ group) or 3 days after (‘late’ group) infection with attenuated Ova-expressing L. monocytogenes (Att LM-Ova) (S3A Fig, experimental design).