Time course of IFNγ production by virus-restimulated or mock-restimulated PBMC that were derived from virus-infected pigs. A shows data for PRRSV-infected pigs; B for PRV Begonia-infected pigs. Full symbols represent individual pig values of IFNγ production by PBMC after restimulation with virus (■ pig 1, ● pig 2, ▲ pig 3, ♦ pig 4, pig 5); empty symbols represent individual pig values of IFNγ production by PBMC after mock-restimulation (□ pig 1, O pig 2, ∆ pig 3, ◊ pig 4, x pig 5). Full lines represent average values for the pigs obtained after restimulation with virus. Dashed lines represent average values for the pigs obtained after mock-restimulation.