(A, B) End1/E6E7 cells were treated with or without IL-22 at the indicated concentrations for 24 h prior to HSV-2 infection. Intracellular and extracellular HSV-2 gD gene expression was measured at 48 h post HSV-2 infection. (C, D) For IL-22 receptor pretreatment, the anti-IL-22R1 antibody and anti-IL-10R2 antibody (10 μg/mL) were added to End1/E6E7 cell cultures for 1 h prior to IL-22 treatment. Intracellular and extracellular HSV-2 gD gene expression was measured at 48 h post HSV-2 infection. The results are the mean ± SD of triplicate cultures, representative of three independent experiments (*P < 0.05, **P < 0.01).