Enterococcus faecalis and Escherichia coli

A bacterial species found in human feces and in the intestines of many warm-blooded animals; occasionally found in urinary infections and in blood and heart lesions in cases of subacute endocarditis; a major cause of nosocomial infection, especially in association with gram-negative pathogens.

Escherichia coli is a Gram-negative, rod-shaped bacterium that is commonly found in the lower intestine of warm-blooded organisms.