Samuel Vilchez, Colorado State University (IMAGE) Colorado State University Caption Samuel Vilchez, chair of the Department of Microbiology at the National Autonomous University of Nicaragua, served as one of the study site principal investigators. Credit Photo courtesy of Samuel Vilchez 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.