Escherichia coli (abbreviated as E. coli) are a large and diverse group of bacteria.Although most strains of E. coli are harmless, others can make you sick. E. coli is a species of bacteria that are gram-stain negative and rod shaped. A bacteria called Escherichia Coli (E Coli) causes about 90 percent of kidney infections. The bacteria migrate from the genitals through the urethra (the tube that removes urine from the body) into the bladder and up the tubes (ureters) that connect the bladder to the kidneys. E. coli, or Escherichia coli, is a bacteria that is present mostly in the digestive system.The bacteria is actually a normal flora of the intestines; it is harmless and beneficial in most cases; however, some strains may cause serious bacterial infections, leading to diarrhea and possible kidney failure. These bacteria normally live in the intestinal tract where they do not cause problems but sometimes move to the urinary tract in women. Some kinds of E. coli can cause diarrhea, while others cause urinary tract infections, respiratory illness and pneumonia, and other illnesses.
The antibiotic resistance of E. coli is increasing rapidly, causing physicians to hesitate when selecting oral antibiotics. Urinary tract infections (UTIs) caused by Escherichia coli (E. coli) are the most common types of infections in women. Rarely they may be due to viral or fungal infections. With proper treatment, Escherichia coli in the urine does not lead to serious complications, notes Mayo Clinic.

Escherichia coli (/ ˌ ɛ ʃ ə ˈ r ɪ k i ə ˈ k oʊ l aɪ /), also known as E. coli (/ ˌ iː ˈ k oʊ l aɪ /), is a Gram-negative, facultative anaerobic, rod-shaped, coliform bacterium of the genus Escherichia that is commonly found in the lower intestine of warm-blooded organisms (endotherms). Uropathogenic E. coli from the gut is the cause of 80–85% of community-acquired urinary tract infections, with Staphylococcus saprophyticus being the cause in 5–10%. E. coli is the leading cause of urinary tract infections, according to UCSF Medical Center. The most common bacterium that causes a canine urinary infection is E. coli. Urinary tract infections caused by E. coli are easily treated, but if left untreated, this bacterium can lead to kidney infection or even kidney failure.. How E. Coli Causes Urinary Infections. A wide variety of organisms is isolated from patients with complicated urinary infection. E. coli commonly live in the intestines of healthy individuals.