The RNA levels of many type I IFN genes, including Ifna13, Ifna7, Ifna1/5/6, Ifna1/2/5, Ifna4, Ifnab, Ifna12, and Ifnb1, were significantly increased in IEC4.1 cells 24 h post-infection (Fig. 2b). This evidence concerns the gene IFNA1 and infection.