Flu-Related GI Flare-Up (IMAGE) Rockefeller University Press Caption Gastrointestinal flare-up can be caused by flu virus infection in the lungs, as shown in this illustration. Credit The Rockefeller University Press, adapted from an illustration by the authors Usage Restrictions Reporters may freely use these materials in news coverage, with the appropriate credit information. 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.