Membrane-Bound Vesicles (IMAGE) NIH/National Heart, Lung and Blood Institute Caption This is an illustration of membrane-bound vesicles containing clusters of viruses, including rotavirus and norovirus, within the gut. Rotaviruses are shown in the large vesicles, while noroviruses are shown in the smaller vesicles. Credit NIH 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.