Capsid (IMAGE) Rice University Caption The spiky capsid shell of the astrovirus believed responsible for a form of juvenile diarrhea contains and protects single-strand RNA until it can be delivered to a cell. Credit Jinhui Dong/Rice University Usage Restrictions Must credit: 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.