A Cell Layer with a Visible Cytopathic Effect (image) Institut Pasteur Share Print E-Mail Caption On the left, a cell layer not damaged by the viruses. On the right, a cell layer with a visible cytopathic effect (CPE); the cells infected by the virus have been destroyed. Credit Institut Pasteur/CNR for Respiratory Viruses at the Institut Pasteur Usage Restrictions Credit: Institut Pasteur/CNR for Respiratory Viruses at the Institut Pasteur. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.