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Actinomyces in the Bloodstream: A Pathogen or Passenger?
Zaraq R Khan1, Lama Hanbali2, Imad Majeed1
1Infectious Diseases, University of Louisville Hospital, Louisville, USA.
Cureus
|August 18, 2025
Summary
Actinomyces bacteremia is often clinically insignificant, with most patients not requiring treatment. This study suggests a cautious approach to antibiotic therapy for Actinomyces in blood cultures.
Area of Science:
- Medical Microbiology
- Infectious Diseases
- Clinical Diagnostics
Background:
- Actinomyces species are common oral and gastrointestinal flora.
- Advances in molecular identification complicate interpretation of Actinomyces in blood cultures.
- Limited data exists on the clinical significance of Actinomyces bacteremia.
Purpose of the Study:
- To assess the clinical relevance of Actinomyces bacteremia.
- To evaluate the impact of Actinomyces bacteremia on treatment decisions.
- To inform judicious antibiotic use for Actinomyces bacteremia.
Main Methods:
- Retrospective, cross-sectional study of 18 patients with Actinomyces bacteremia.
- Data collected from June 2022 to May 2023 at University of Louisville Healthcare.
- Chart review included clinical presentation, treatment, imaging, and outcomes.
Main Results:
- Most patients (88.89%) did not receive treatment for Actinomyces bacteremia.
- Mean follow-up was 6.58 months.
- Mortality was 33.33%, with some deaths unrelated to Actinomyces.
Conclusions:
- Actinomyces bacteremia is frequently clinically insignificant.
- Prolonged antibiotic therapy may not be necessary for most cases.
- A cautious approach to treatment is recommended.
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