Kinetics of influx of CD4+ Foxp3+ regulatory T cells in mice infected with strains HN878 and SA161. The total numbers of CD4+ Foxp3+ cells in the lungs of control (closed circles) and BCG-vaccinated (open circles) mice were analyzed by flow cytometry. The data are expressed as the mean percentage of total CD4 cells in each organ ± SEM (n = 5 mice per group). Data points indicated by asterisks were significantly different from results for saline controls. NS, not significant.