CD8A and pneumonitis: Our study demonstrated that although pgB/pGP96‐NT co‐immunization could induce humoral immune responses (Figure 2C), it could induce pulmonary CD8 TRM cell responses (Figure 6A) that facilitated pulmonary‐resident CD8 T‐cell expansion upon MCMV challenge (Figure 5A), which might provide new avenues to enhance protection efficacy upon MCMV pneumonitis.