CD4 and viral encephalitis: We found that no significant difference existed in the proportion of the peripheral blood CD3 + T cells, CD3 + CD4 + T cells, CD3 + CD8 + T cells, the ratio of CD3 + CD4 + /CD3 + CD8 + and NK cells in LGI1 encephalitis patients (n = 6) compared with HDs (Fig. 7A–E).