Tracking the Infection (IMAGE) Penn State Caption Tracking a viral infection in a single cell. Top images show a single cell in the well of a microfluidic device that allows researchers to track the dynamics of a viral infection one cell at a time. First a bright-field image showing the cell, then three images showing the intensity of the fluorescence from viruses infecting the cell that produce green-fluorescent protein (GFP) at three time points post infection (hpi). Graph at bottom shows the intensity of GFP expression from the viruses in the cell over the course of the infection for 24 hours post infection. Credit Penn State Usage Restrictions Image credit must be published alongside the image. License Licensed content 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.