Pathogen Police (image) Brown University Share Print E-Mail Caption Once a CD8 T cell has fought off a virus, it is prepared to fight it off again. New research shows that it can also answer the call when the body signals the presence of other pathogens. Credit Dennis Kunkel/Dennis Kunkel Microscopy Inc. Usage Restrictions with credit 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.