Thy1.1+ OT-I cells (1.0 × 104) were transferred i.v. and mice were infected with 104 CFU Listeria monocytogenes strains expressing OVA APL epitope (LM-OVA APLs) (15 (link)) 24 h later. Secondary effectors were generated in 4 week post-infection mice by immunizing with 50 µg N4 OVA peptide (GenScript) emulsified in IFA (Gibco) in both hind foot pads. Five days later, draining popliteal LNs were collected and pooled for analysis. Serum was analyzed using Ready-Set-Go ELISA kit according to manufacturer’s instructions (eBiosciences).