Wepking Strickland Research Team (IMAGE) Colorado State University Caption For the study, researchers analyzed ecosystems exposed to manure from cattle given no antibiotics and manure from cattle given a common antibiotic, as well as a control sample not exposed to manure. Credit Carl Wepking/CSU 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.