Here's a look at what E. coli is and how to know if you're infected. Escherichia coli (E. coli) is a bacteria found in many places, including the environment, foods and water. It also resides ...

Escherichia coli, or E. coli, are usually harmless bacteria commonly found in your intestines. However, some strains of E. coli produce a substance called Shiga toxin, which causes infections.