PDCD1 and viral infectious disease: Functional Enrichment analysis of mRNAs and miRNAs in lungs and spleens obtained from IAV infection mice treated with anti-PD-1 antibody clearly highlighted myocardial damage related to viral infection, mitogen-associated protein kinase (MAPK) signaling pathways, RAP1 (Ras-related protein 1) signaling pathway, and Axon guidance.