CD274 and COVID-19: Besides, the KEGG pathway analysis identified virus-related pathways, including Influenza A, Measles, Epstein-Barr virus infection, and COVID-19, as well as inflammatory and immune-related signaling pathways, such as the NOD-like receptor signaling pathway, NF-kB signaling pathway, IL-17 signaling pathway, TNF signaling pathway, PD-L1 expression, and PD-1 checkpoint pathway, and B cell receptor signaling pathway.