Bacteria Carried as Weapons? (IMAGE) Washington University in St. Louis Caption These are Petri dishes containing some of the many bacterial symbionts carried by social amoeba farmers. Credit Courtesy of Debra Brock Usage Restrictions Please 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.