Klebsiella pneumoniae
It is common in nature and may be found in both soil and water. It lives in dead or decaying matter. There are many different variants within the whole species (strains) and the 20% of those can capture nitrogen from the atmosphere and fix nitrogen when growing in the absence of oxygen. K. pneumoniae also happen in places that aren't feces-contaminated, including industrial wastes that are rich in nutrients (Bagley and Seidler, 1977).