Norovirus (IMAGE) University of Pennsylvania School of Medicine Caption A new mouse study shows that, even in immunized animals, noroviruses can escape the immune system and still spread by hiding out in an extremely rare type of cell in the gut. Credit Center for Disease Control and Prevention Usage Restrictions None 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.