Objective :To investigate the effect of berberine on the cytoskeleton and permeability of human umbilical vein endothelial cells(HUVECs)infected with influenza virus A/PR/8/34(H1 N1).Methods :Influenza virus A/PR/8/34 were passaged in embryonated chicken eggs,and samples of allantoic fluid were stored at-80 ℃.Virus titer was measured by plaque assay.HUVEC were seeded in 96-well plates.MTT assay was used to detect the toxicity of berberine to HUVEC.The HUVECs in the virus and berberine group of HUVEC were st...