Viral infections such as rhinovirus, influenza virus, human immunodeficiency virus and bovine viral diarreha virus frequently result in the generation of oxidative stress in the infected cells [4] [5] [6] [7] . The events leading to the generation of ROS during viral infections are still unclear. Also, antioxidants have been shown to have Figure 1 The effects of Q7R on PEDV-induced CPE. Culture medium 6-well tissue culture plates were removed and the cells were washed with PBS. Then, 0.09 ml of diluted virus suspension and 0.01 ml of medium supplemented with typsin-EDTA containing Q7R of 10 μg/ml were added. After incubation at 37°C in 5% CO 2 for 2 days, the morphology of cells was investigated under microscope and a photograph taken.