TNF and infection: The aim of this study was to evaluate the quantification by qRT-PCR of the expression of pro-inflammatory (IL-1β, IFN-γ, TNF-α) and regulatory (IL-10, TGF-β, IL-4) cytokines, as well as the transcription factor and FoxP3, in the liver and hepatic lymph node (HLN) of sheep primoinfected and reinfected with F. hepatica during early and late stages of infection.