Norovirus (IMAGE) University of Gothenburg Caption The picture shows the structure of a norovirus (40 nm in diameter), the one causing winter vomiting disease, with 12 of the 180 glycan-binding sites indicted with green circles. Credit Waqas Nasir, Sahlgrenska Academy, Sweden 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.