At 3 weeks after infection, one of the two groups of each of the WT Pru- and ΔGRA3-infected SCID mice received CD8+ immune T cells (3 × 106 cells) from WT mice infected with the ME49 strain, and another group of each of the WT Pru- and ΔGRA3-infected SCID mice did not receive any T cells as a control. Here, CD8A is linked to infection.