Then, PK-15/PB and PK-15/IRF1 cells were infected with swine viruses at a multiplicity of infection (MOI) of 0.1 TCID50/mL for SIV and TGEV, at a MOI of 0.1 PFU/mL for VSV and PRV-QXX. This evidence concerns the gene IRF1 and infection.