A genus of lactic acid bacteria of the phylum
Firmicutes. Enterococci are Gram-positive cocci that
often occur in pairs (diplococci) or short chains and
are difficult to distinguish from Streptococci on
physical characteristics alone. Two species are common
commensal organisms in the intestines of humans: E.
faecalis (90-95%) and E. faecium (5-10%). There are rare
clusters of infections with other species including E.
casseliflavus, E. raffinosus.