Enterococcus faecalis: Difference between revisions
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==Overview== | |||
'''''Enterococcus faecalis''''' is a [[Gram-positive]] [[commensal]] [[bacterium]] inhabiting the [[gastrointestinal tract]]s of humans and other mammals.<ref name=Sherris>{{cite book | author = Ryan KJ, Ray CG (editors) | title = Sherris Medical Microbiology | edition = 4th ed. | pages = 294–5 | publisher = McGraw Hill | year = 2004 | isbn = 0-8385-8529-9 }}</ref> Like other species in the [[genus]] ''[[Enterococcus]]'', ''E. faecalis'' can cause life-threatening infections in humans, especially in the [[nosocomial]] (hospital) environment: the naturally high levels of antibiotic resistance found in ''E. faecalis'' contribute to its pathogenicity.<ref name=Sherris /> | '''''Enterococcus faecalis''''' is a [[Gram-positive]] [[commensal]] [[bacterium]] inhabiting the [[gastrointestinal tract]]s of humans and other mammals.<ref name=Sherris>{{cite book | author = Ryan KJ, Ray CG (editors) | title = Sherris Medical Microbiology | edition = 4th ed. | pages = 294–5 | publisher = McGraw Hill | year = 2004 | isbn = 0-8385-8529-9 }}</ref> Like other species in the [[genus]] ''[[Enterococcus]]'', ''E. faecalis'' can cause life-threatening infections in humans, especially in the [[nosocomial]] (hospital) environment: the naturally high levels of antibiotic resistance found in ''E. faecalis'' contribute to its pathogenicity.<ref name=Sherris /> | ||
Revision as of 14:27, 24 June 2015
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| Enterococcus faecalis as viewed through a scanning electron microscope Enterococcus faecalis as viewed through a scanning electron microscope
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| Enterococcus faecalis (Orla-Jensen 1919) Schleifer & Kilpper-Bälz 1984 |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
Enterococcus faecalis is a Gram-positive commensal bacterium inhabiting the gastrointestinal tracts of humans and other mammals.[1] Like other species in the genus Enterococcus, E. faecalis can cause life-threatening infections in humans, especially in the nosocomial (hospital) environment: the naturally high levels of antibiotic resistance found in E. faecalis contribute to its pathogenicity.[1]
Pathogenesis
E. faecalis can cause endocarditis, as well as bladder, prostate, and epididymal infections; nervous system infections are less common.[1][2]
E. faecalis is resistant to many commonly used antimicrobial agents (aminoglycosides, aztreonam, cephalosporins, clindamycin, the semi-synthetic penicillins nafcillin and oxacillin, and trimethoprim-sulfamethoxazole). Exposure to cephalosporins is a particularly important risk factor for colonization and infection with enterococci.
Historical
Prior to 1984, enterococci were members of the genus Streptococcus: thus E. faecalis was known as Streptococcus faecalis.[3]
Gallery
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![SEM depicts a small group of Gram-positive Enterococcus faecalis bacteria. From Public Health Image Library (PHIL). [4]](/images/d/d5/Enterococcus08.jpeg)
SEM depicts a small group of Gram-positive Enterococcus faecalis bacteria. From Public Health Image Library (PHIL). [4]
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![Enterococcus faecalis cultured on an agar plate, testing for drug sensitivity in an anaerobic environment. From Public Health Image Library (PHIL). [4]](/images/7/7c/Enterococcus05.jpeg)
Enterococcus faecalis cultured on an agar plate, testing for drug sensitivity in an anaerobic environment. From Public Health Image Library (PHIL). [4]
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![SEM depicts Gram-positive Enterococcus faecalis sp. bacteria. From Public Health Image Library (PHIL). [4]](/images/c/ca/Enterococcus02.jpeg)
SEM depicts Gram-positive Enterococcus faecalis sp. bacteria. From Public Health Image Library (PHIL). [4]
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![Quantitative difference in hemolytic reactivity seen on BAP with group-D Streptococci (left wedge), group-B Streptococci (middle wedge), and group-A Streptococci (right wedge) bacteria. From Public Health Image Library (PHIL). [4]](/images/f/f5/Group_A_streptococcus04.jpeg)
Quantitative difference in hemolytic reactivity seen on BAP with group-D Streptococci (left wedge), group-B Streptococci (middle wedge), and group-A Streptococci (right wedge) bacteria. From Public Health Image Library (PHIL). [4]
![SEM depicts a small group of Gram-positive Enterococcus faecalis bacteria. From Public Health Image Library (PHIL). [4]](/index.php/File:Enterococcus08.jpeg)
![Enterococcus faecalis cultured on an agar plate, testing for drug sensitivity in an anaerobic environment. From Public Health Image Library (PHIL). [4]](/index.php/File:Enterococcus05.jpeg)
![SEM depicts Gram-positive Enterococcus faecalis sp. bacteria. From Public Health Image Library (PHIL). [4]](/index.php/File:Enterococcus02.jpeg)
![Quantitative difference in hemolytic reactivity seen on BAP with group-D Streptococci (left wedge), group-B Streptococci (middle wedge), and group-A Streptococci (right wedge) bacteria. From Public Health Image Library (PHIL). [4]](/index.php/File:Group_A_streptococcus04.jpeg)
References
- ↑ 1.0 1.1 1.2 Ryan KJ, Ray CG (editors) (2004). Sherris Medical Microbiology (4th ed. ed.). McGraw Hill. pp. 294&ndash, 5. ISBN 0-8385-8529-9.
- ↑ Pelletier LL (1996). Microbiology of the Circulatory System. in: Baron's Medical Microbiology (Baron S et al, eds.) (4th ed. ed.). Univ of Texas Medical Branch. ISBN 0-9631172-1-1.
- ↑ Schleifer KH; Kilpper-Balz R (1984). "Transfer of Streptococcus faecalis and Streptococcus faecium to the genus Enterococcus nom. rev. as Enterococcus faecalis comb. nov. and Enterococcus faecium comb. nov". Int. J. Sys. Bacteriol. 34: 31&ndash, 34.
- ↑ 4.0 4.1 4.2 4.3 "Public Health Image Library (PHIL)".