Escherichia coli (E. coli) bacteria (IMAGE) Salk Institute Caption Escherichia coli (E. coli) bacteria, pictured here, is a common gut bacteria in both humans and animals. There are many different strains, some of which cause disease. Credit fusebulb/Shutterstock.com Usage Restrictions with usage and related coverage. 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.