The results of this study found that NE infection resulted in the upregulation of the ratios of Tc and Th17 cells and Th17/Treg cells in the ileum, the decrease of the ratio of Tc cells, the activation of TLR2-NF-κB signals in the jejunum and ileum, and upregulation of the expression of the Th17 cell-related genes RORα, IL-6, TGF- β1. This evidence concerns the gene TLR2 and infection.