The production of inflammatory cytokines in the target tissue is part of the innate immune response to viral infection (24), the levels of cytokines (interleukin (IL)-6, IL-8, Tumor necrosis factor (TNF)-α, and interferon (IFN)-α) in the jejunum and colon of piglets were detected using the qRT-PCR. Here, TNF is linked to viral infectious disease.