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Capnophilic and anaerobic bacteremia in neutropenic patients: an oral source
F Baquero1, J Fernández, F Dronda
1Service of Microbiology Hospital Ramón y Cajal, Madrid, Spain.
Abstract:
The currently accepted empiric antibiotic therapy for bacterial infections in neutropenic patients may not cover the possibility of capnophilic and anaerobic bacteremia. Many of these infections develop in patients with severe mucositis or periodontitis, and the type of organisms recovered also suggests an oral source of infection. We present two cases of bacteremia in neutropenic patients who had been empirically treated with ceftazidime and piperacillin plus amikacin. In the first case a beta-lactamase-producing strain of Capnocytophaga ochracea was isolated; in the second case bacteremia was due to a mixture of Leptotrichia buccalis and Fusobacterium nucleatum. These observations emphasize the necessity for a reevaluation of the possible use of antimicrobial agents active against beta-lactamase-producing capnophilic organisms and anaerobic bacteria during empiric therapy in neutropenic patients with an oral source of infection.
Insights
Empiric antibiotic therapy for neutropenic patients may miss oral bacteria like Capnocytophaga and Fusobacterium. Reevaluating antibiotic choices is crucial for effective treatment of these infections.
Area of Science:
- Infectious Diseases
- Hematology
- Microbiology
Background:
- Neutropenic patients are highly susceptible to bacterial infections.
- Current empiric antibiotic regimens may not adequately cover all potential pathogens.
Observation:
- Two cases of bacteremia in neutropenic patients receiving standard empiric therapy are presented.
- Infections involved beta-lactamase-producing Capnocytophaga ochracea and a mix of Leptotrichia buccalis and Fusobacterium nucleatum.
- Oral source of infection was suspected due to patient conditions (mucositis, periodontitis).
Findings:
- Standard empiric antibiotics (ceftazidime, piperacillin/amikacin) were insufficient to eradicate these specific oral bacteria.
- Beta-lactamase production in Capnocytophaga ochracea poses a challenge to common antibiotic treatments.
Implications:
- Current empiric antibiotic strategies for neutropenic patients require reassessment.
- Consideration of antimicrobial agents targeting beta-lactamase-producing capnophilic and anaerobic bacteria is necessary.
- Improved treatment protocols may reduce mortality and morbidity in neutropenic patients with oral infections.