Is e coli a parasite

No, E. Coli is not a parasite. Far from it, in fact. E. Coli is an essential microorganism in your intestines that aids in the digestion of sugar and other nutrients. There are literally billions of them in every healthy human digestive tract and without them we could not survive. However, There is a special line of E. Coli (O-157) that arise which are prominent causes of urinary tract infections.