Figure 4From: Viral persistence in colorectal cancer cells infected by Newcastle disease virusDetection of infectious viral progenies secreted into cell culture media. (A) A plaque assay was performed using spent culture media of the mock-infected SW480P and control cells. Different plaque morphologies were visible in the different samples. (B) A graphical representation of the number of plaques of less than 1Â mm or in the range of 1-4Â mm is shown.Back to article page