However, at 6, 36, 48 and 60 h post infection, the titers of PRVΔTK&gE−AH02, PRV-S(UL11-10)ΔTK/gE, PRV-S(UL35-36)ΔTK/gE and PRV-S(UL46-27)ΔTK/gE were lower than PRV AH02LA, which may due to the deletion of TK and gE. Here, TKT is linked to infection.