IntroductionEscherichia coli or E. coli are a large group of bacteria and there are many different kinds. Most strains of E. coli are harmless and others can make you sick. Some types of E. coli can cause diarrhea and others cause urinary tract infections, respiratory illness, pneumonia, and other illnesses. Some other kinds of E. coli are used as markers for water contamination, so you might hear about E. coli being found in water for drinking, which are not harmful themselves, but indicate the water is contaminated. It does get a bit confusing. Shiga toxin-producing E. coli (STEC) is a bacteria that could cause severe food type diseases. Main sources of outbreaks are raw or undercooked meat products, raw milk, and faecal contamination of vegetables. II. Scientific InformationEscherichia coli or E. coli is a bacteria. It is part of the class gammaproteobacteria, its order is enterobacteriales and E. coli is from the family Enterobacteriaceae. Escherichia coli bacteria usually live in the intestines of people and animals. Most E. coli are harmless and are an important part of a good and healthy human. However, some E. coli are pathogenic, which means they could cause illness, either diarrhea or illness outside of the intestines. The types of E. coli that can cause diarrhea can be transmitted through water that is contaminated or food that is contaminated, or through contact with animals or people. E. coli can grow slowly in refrigerated temperatures, E. coli O157:H7 has been shown to survive in acidic food products like apple cider or mayonnaise. III. Impact on our LivesPeople who suffer severe E. coli O157:H7 poisoning face a 30% higher risk of high blood pressure or kidney damage. In severe cases, people may die. But in most cases, symptoms clear up on their own in around 5 to 10 days. The using of antibiotics isn’t recommended because the bacteria creates a toxin in the cell and if you end up killing the cell with antibiotics the toxins get released into the bloodstream. In a very small number of cases, some E. coli contamination can lead to hemolytic uremic syndrome, a condition that is life-threatening and is treated in hospital intensive care places. It kills 3-5% of people who get it. Some people who recover might still have to live with complications that are blindness, paralysis and kidney failure.