Enterococcus: Difference between revisions
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Enterococcus
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===Species=== |
===Species=== |
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* |
*[[Enterococcus faecalis]] |
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**More common (90-95%) |
**More common (90-95%) |
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**More commonly genitourinary source |
**More commonly genitourinary source |
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**More susceptible to antibiotics |
**More susceptible to antibiotics |
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* |
*[[Enterococcus faecium]] |
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**Less common (5-10%) |
**Less common (5-10%) |
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**More commonly gastrointestinal source |
**More commonly gastrointestinal source |
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**Less susceptible to antibiotics |
**Less susceptible to antibiotics |
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**Most common VRE |
**Most common VRE |
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* |
*[[Enterococcus gallinarum]] |
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* |
*[[Enterococcus casseliflavus]] |
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* |
*[[Enterococcus hirae]], a rare zoonotic pathogen from chickens that can cause [[bacteremia]] and [[endocarditis]] |
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===Vancomycin Resistance=== |
===Vancomycin Resistance=== |
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==Management== |
==Management== |
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* [[Vancomycin]] is usually reliable (except for |
* [[Vancomycin]] is usually reliable (except for [[Enterococcus gallinarum]] and [[Enterococcus casseliflavus]]) |
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* [[Ampicillin]] is preferred for susceptible strains |
* [[Ampicillin]] is preferred for susceptible strains |
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* Inherent resistance to [[cephalosporins]] |
* Inherent resistance to [[cephalosporins]] |
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Revision as of 15:51, 7 November 2022
Background
Microbiology
- Genus of facultative anaerobic, non-spore-forming, alpha- or gamma-hemolytic, catalase negative, Gram-positive cocci
- Grows on bile esculin agar
- PYR positive
- Most are Lancefield group D
- Commensal gut flora
- Increasing antibiotic resistance
Species
- Enterococcus faecalis
- More common (90-95%)
- More commonly genitourinary source
- More susceptible to antibiotics
- Enterococcus faecium
- Less common (5-10%)
- More commonly gastrointestinal source
- Less susceptible to antibiotics
- Most common VRE
- Enterococcus gallinarum
- Enterococcus casseliflavus
- Enterococcus hirae, a rare zoonotic pathogen from chickens that can cause bacteremia and endocarditis
Vancomycin Resistance
- Vancomycin binds to d-Ala-d-Ala pentapeptids, interfering with cell wall synthesis
- VanA: most common. Mutation to d-Ala-d-Lac, leading to high resistance to glycopeptides.
- VanB: more common in E. faecium in Australia
- VanC: chromosomal resistance on E. gallinarum and E. casseliflavus
Management
- Vancomycin is usually reliable (except for Enterococcus gallinarum and Enterococcus casseliflavus)
- Ampicillin is preferred for susceptible strains
- Inherent resistance to cephalosporins
- Resistant to ertapenem, but ampicillin-susceptible strains are often susceptible to imipenem and (less reliably) to meropenem
VRE
- Daptomycin, doxycycline, linezolid, tedizolid, oritavancin, quinupristin-dalfopristin (for E. faecium)
References
- ^ James H. Jorgensen, Sharon A. Crawford, Cynthia C. Kelly, Jan E. Patterson. In VitroActivity of Daptomycin against Vancomycin-Resistant Enterococci ofVarious Van Types and Comparison of Susceptibility TestingMethods. Antimicrobial Agents and Chemotherapy. 2003;47(12):3760-3763. doi:10.1128/aac.47.12.3760-3763.2003.
