Immune characteristics of γδ T cells in flavivirus infections. Human γδ T cells can primarily be divided into three main subsets: Vδ1, Vδ2, and Vδ3. γδ T EMRA cells, as effector T cells, can directly kill virus-infected cells, while γδ TEM cells, as central memory cells, often secrete cytokines such as IFN-γ to exert indirect antiviral effects. Here, IFNG is linked to Flavivirus Infections.