Enterococcus faecalis Infection Treatment Guidelines

Introduction to E. faecalis

E. faecalis is a significant pathogen in various infections, particularly in healthcare-associated settings, representing up to 15.9% of aerobic isolates in intra-abdominal infections 1
E. faecalis poses treatment challenges due to its intrinsic resistance to multiple antibiotics and ability to acquire additional resistance mechanisms 2
The organism requires prolonged administration (up to 6 weeks) of synergistic bactericidal combinations for effective treatment 2

The Infectious Diseases Society of America recommends ampicillin or amoxicillin as the drug of choice for ampicillin-susceptible enterococci 3
For serious infections, combination therapy with ampicillin plus gentamicin is traditionally recommended for synergistic bactericidal effect 4
Vancomycin should be used if the pathogen is resistant to ampicillin 3
Linezolid (for monomicrobial infections) 1 and Tigecycline (for polymicrobial infections) 1 are alternative options
Daptomycin may be used based on susceptibility testing 3

Aminoglycoside resistance is increasingly common in enterococci, limiting the effectiveness of traditional synergistic combinations 4
Catheter-related bloodstream infections caused by enterococci require catheter removal in cases of insertion site infection, suppurative thrombophlebitis, sepsis, endocarditis, or persistent bacteremia 3
Antibiotic lock therapy should be used in addition to systemic therapy if an infected catheter must be retained 3

For uncomplicated enterococcal infections: 7-14 days of therapy is typically recommended 3
For serious infections like endocarditis: 4-6 weeks of therapy is required 2, 4

Do not confuse colonization with true infection; differentiation is essential before initiating treatment 5
Be aware that antibiotic use itself can lead to E. faecalis colonization by disrupting normal gut microbiota 5