ILF2 and infection: Over-expression of ILF2 resulted in a significantly decrease of virus titers in PRRSV-infected MARC-145 cells at 24 h (p < 0.01), 36 h (p < 0.01), 48 h (p < 0.05) post-infection (Fig. 7c), suggesting that the over-expression of ILF2 impacts the replication efficiency of PRRSV.