Moreover, Fasina et al. [53] reported an increase in IFN-γ expression from the ileum at 10 dpi following ST infection, while Whithanage et al. [58] observed upregulation in IFN-γ expression from the same gut-segment from 3 to 14 dpi in SPF Rhode Island Red chicks that were infected with 108 CFU of ST at 7 day-olds. Here, IFNG is linked to infection.