For intestinal barrier-related gene (Mucin-1, Mucin-2, Occludin and ZO-1), in the ileal mucosa, PRV AH02LA infection down-regulated (p < 0.05) Occludin gene expression, but had no impact on Mucin-1, Mucin-2, and ZO-1 gene expression. This evidence concerns the gene MUC1 and infection.