E. Coli can be found in many areas. Firstly, they exist in faecally-contaminated environments including water, sediment and mud. Secondly, the prevalent habitat of Escherichia Coli is gastrointestinal (GI) tract of humans and other warm blooded animals. This eubacteria is the most abundant facultatively anaerobic microorganism found in the gastrointestinal tract and other warm blooded animals. The average human contains about 0.1% to 1% of E. Coli in their body (intestines). Furthermore, this percentage makes E. Coli the largest group of bacteria living in the intestines. Freter’s Nutrient- Niche theory states that due to the wide variety of nutrients found in the intestines, these organs have a suitable environment for the E. Coli is colonize. Thirdly, if the E. Coli comes in contact with raw vegetables, it has the potential to attach itself to the leaves of the vegies. Lastly, E. Coli can also be found on ground meats.