Overview
Fusobacterium necrophorum is a gram-negative anaerobic bacterium that can cause invasive infections, including Lemierre's syndrome (LS), characterized by thrombophlebitis of the internal jugular vein often following an oropharyngeal infection 1.Diagnosis
Clinical Presentation: Fever, neck stiffness, and signs of sepsis; often preceded by pharyngitis or tonsillitis 1.
Laboratory Tests: Positive blood cultures for F. necrophorum; sequencing of 16S rDNA, targeted PCR, or culture from sterile sites 1.
Imaging: CT or MRI may show thrombophlebitis or abscesses 1.
Epidemiology: Higher incidence noted in young adults, with increasing trend observed from 2010 to 2017 1.Management
Antibiotics: First-line treatment with beta-lactamase resistant penicillins (e.g., piperacillin-tazobactam) or carbapenems 1.
Duration: Typically 14-21 days of intravenous therapy, followed by oral antibiotics if clinically stable 1.
Supportive Care: Includes hemodynamic support, surgical drainage for abscesses if necessary 1.Special Populations
Pediatrics: Limited data; management similar to adults but with closer monitoring 1.
Elderly: Increased risk of complications; tailored supportive care and close surveillance required 1.
Comorbidities: Presence of underlying conditions may necessitate more aggressive management; individualized treatment plans are crucial 1.Key Recommendations
Diagnose invasive F. necrophorum infections through positive blood cultures or molecular diagnostics from sterile sites (Evidence: Moderate 1).
Initiate broad-spectrum antibiotic therapy targeting anaerobic coverage, such as piperacillin-tazobactam or carbapenems, for at least 2 weeks (Evidence: Moderate 1).
Monitor for and manage complications including thrombophlebitis and abscesses with appropriate imaging and surgical intervention as needed (Evidence: Expert opinion 1).References
1 Nygren D, Holm K. Invasive infections with Fusobacterium necrophorum including Lemierre's syndrome: an 8-year Swedish nationwide retrospective study. Clinical microbiology and infection : the official publication of the European Society of Clinical Microbiology and Infectious Diseases 2020. link