These findings imply that the target genes are connected to many networks, including Cytokine-cytokine receptor interaction, Chemokine signaling pathway, Viral protein interaction with cytokine and cytokine receptor, PI3K-Akt signaling pathway, Toll-like receptor signaling pathway, Influenza A, Jak-STAT signaling pathway, Kaposi sarcoma-associated herpesvirus infection, Epstein-Barr virus infection, Human immunodeficiency virus 1 infection. The gene discussed is PIK3CD; the disease is Epstein-Barr virus infection.