Effect of different colchicine concentrations on RSV replication. After RSV infection, BEAS-2B cells were treated with 50, 100, 200, 250, 300, 350, and 400 µM concentrations of colchicine for 24 h. Immunostaining was used for counting viral plagues to determine replication. *P < 0.05 and **P < 0.01 vs. RSV-infected cells