PLP1 and clostridium difficile infection: Peak disease and CDI did not differ between immunized CD8-KO mice infected with either LM-OVA or LM-PLP (peak scores: 3.5 ± 0.3 vs. 3.5 ± 0.3; CDI: 53.6 ± 5.3 vs. 53.9 ± 1.6).