The identity of the memory T-cells induced in response to L.inn::vgc infection was confirmed by testing the CD44 expression on the CD8+ T-cells following recall infection with Lm where high expression of CD44 was observed on CD8+ T-cells derived from mice primarily infected with the recombinant L.inn::vgc strain but not with the wild type L.inn (Fig. S3). The gene discussed is CD44; the disease is infection.