Mice were i.p. injected with IgG isotype control or anti-IL10 antibodies one day prior to RSV A2 infection and 3 days after infection. BAL fluid was collected 6 days after infection and infiltration of inflammatory cells was examined. A. Total number of inflammatory cells in BAL fluid. B–E. Neutrophils, eosinophils, macrophages, and lymphocytes in BAL fluid. * p<0.05 compared to STAT1 KO mice treated with isotype control antibody, ‡ p<0.05 compared to isotype control antibody within strain of mice, n=4–5 mice for each group.