(a) Representative Scatchard plots for β2-AR density and affinity in peripheral lung homogenates from mice infected with RSV for 2 days, compared with uninfected mice (mean data from 2 experiments). (b) Effect of RSV infection for 2 and 6 days on β2-AR density in mouse peripheral lung homogenates (Uninf, uninfected). (c) Effect of RSV infection for 2 and 6 days on β2-AR ligand affinity in mouse peripheral lung homogenates (Uninf, uninfected). n=3 replicate assays per group (15–20 mice per group per replicate). * P<0.05, # P<0.005, compared with untreated mice (by paired ANOVA).