Although there are no past studies that assessed and compared the recruitment of T cells and macrophages in the tissues following infection with wildtype and CEO vaccine revertant ILTV, our observation is in agreement with a previous study [49], where infiltrations of CD4+ and CD8+ T cells, and macrophages were observed in the trachea of ILTV strain 1874C5 infected chickens. This evidence concerns the gene CD8A and infection.