Cells and virus infection
Cells: HUVECs (CRL-1730) were cultured in DMEM supplemented with 10% FBS and endothelial cell growth supplement at 37 C in a 5% CO2 incubator.The cells used in passages 5–8 were seeded into six-well plates at 5x105/well and cultured for 24 h before virus infection experiments.