No statistically significant differences in IFN-γ producing cells were observed between the groups, although in Exp 1, PRRSV-2/H3N2 co-infection induced slightly higher IFN-γ secretion in BALCs when compared to H3N2 single infection (mean of 307 vs. 113 IFN-γ-producing cells/106 cells, respectively). Here, IFNG is linked to infection.