Escherichia Coli (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption A scanning electron micrograph of Escherichia coli, which are one of many strains of bacteria found in mammalian guts. Credit National Institute of Allergy and Infectious Diseases, National Institutes of Health 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.