Enterococcus faecium

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Not to be confused with Enterococcus faecalis.
Enterococcus faecium
Scientific classification
Kingdom: Bacteria
Phylum: Firmicutes
Class: Bacilli
Order: Lactobacillales
Family: Enterococcaceae
Genus: Enterococcus
Species: E. faecium
Binomial name
Enterococcus faecium
(Orla-Jensen 1919)
Schleifer & Kilpper-Bälz 1984

Enterococcus faecium is a Gram-positive, alpha-hemolytic or nonhemolytic bacterium in the genus Enterococcus.[1] It can be commensal (innocuous, coexisting organism) in the human intestine, but it may also be pathogenic, causing diseases such as neonatal meningitis or endocarditis.

Vancomycin-resistant E. faecium is often referred to as VRE.[2]

Some strains of E. faecium are used as probiotics in animals.[3]


Linezolid or daptomycin is used to treat VRE infections. The streptogramins, such as quinupristin/dalfopristin, may also be used for VREs, but not E. faecalis. VRE can be successfully treated with sultamicillin.[4]


  1. ^ Ryan KJ, Ray CG (editors) (2004). Sherris Medical Microbiology (4th ed.). McGraw Hill. pp. 294–5. ISBN 0-8385-8529-9. 
  2. ^ Mascini EM, Troelstra A, Beitsma M, et al. (March 2006). "Genotyping and preemptive isolation to control an outbreak of vancomycin-resistant Enterococcus faecium". Clin. Infect. Dis. 42 (6): 739–46. doi:10.1086/500322?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub%3dncbi.nlm.nih.gov. PMID 16477546. 
  3. ^ http://www.purinaveterinarydiets.com/Product/FortiFloraCatNutritionalSupplements.aspx
  4. ^ Chewning JH, et al.. "Vancomycin resistant Enterococcus faecium bacteremia successfully treated with high dose ampicillin sulbactam in a pediatric patient after hematopoietic stem cell transplantation". J. Pediatr. Hematol. Oncol.2011rfr_id=10.1097/MPH.0b013e31820db7eb.