CD8A and infection: The most abundant gene transcripts during the later stages of viral clearance are ones involved in T‐cell activation and induction of apoptosis.51 Models describing the CD8+ T‐cell response have investigated their differentiation, proliferation, specificity, efficacy in killing infected cells, and how they can be manipulated to provide long‐lived protection from natural infection or by vaccination.18, 26, 27, 28, 32, 72 Although the published models have different formulations, the resulting dynamics from each can successfully fit pulmonary CD8+ T cell counts from both humans and mice.