Liman and Rautenschlein [7] demonstrated that the percentage of CD4+ T cells subpopulation (but not CD8+ T cells) increased briefly in HG of turkeys 7–14 DPV after vaccination with aMPV/B or after infection with aMPV/A or B, which corroborates our results for MDA+ vaccinated birds. Here, CD8A is linked to infection.