Treg cells (CD4+, CD25bright, FoxP3+) and IL-17 level following infection with RSV in immunized mice. BALB/c mice were immunized subcutaneously with AdF.RGD (1010 pu/mouse) or FIRSV (105 pfu). A, B. Five wk later the mice were challenged intranasally with RSV (106 pfu) for 6 days and lung suspensions were analyzed for Treg cells by flow cytometry and IL-17 cytokine level. A. Treg cells. B. IL-17. Data are presented as mean ± SEM of 4 mice/group from one of two independent experiments.* and ** denote significance of p < 0.05 and p < 0.01, respectively.