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Liver abscess caused by Streptococcus milleri
D Chua1, H H Reinhart, J D Sobel
1Department of Medicine, Wayne State University School of Medicine, Detroit, Michigan.
Abstract:
There is now convincing evidence that Streptococcus milleri is an important cause of pyogenic liver abscesses. The clinical course is no different from that of pyogenic infections of the liver arising from other causes. A positive blood culture should alert the clinician to the possibility of hepatic suppuration. Treatment consists of drainage by laparotomy or percutaneous aspiration combined with approximately 6 weeks of penicillin administration. Patients with liver abscesses who receive metronidazole may not respond if S. milleri is the infecting organism.
Insights
Streptococcus milleri is a common cause of pyogenic liver abscesses. Effective treatment involves drainage and penicillin, as metronidazole may be ineffective against this specific bacterium.
Area of Science:
- Microbiology
- Infectious Diseases
- Hepatology
Background:
- Pyogenic liver abscesses are serious infections requiring prompt diagnosis and treatment.
- Identifying the causative pathogen is crucial for effective antimicrobial therapy.
Observation:
- Streptococcus milleri has been identified as a significant etiological agent in pyogenic liver abscesses.
- Clinical presentation of Streptococcus milleri-induced liver abscesses is similar to those caused by other pathogens.
Findings:
- Positive blood cultures can indicate the presence of hepatic suppuration.
- Optimal treatment includes surgical or percutaneous drainage coupled with a 6-week course of penicillin.
- Metronidazole therapy may be associated with treatment failure when Streptococcus milleri is the causative organism.
Implications:
- Clinicians should consider Streptococcus milleri in the differential diagnosis of pyogenic liver abscesses.
- Antimicrobial stewardship should guide treatment selection, avoiding metronidazole when Streptococcus milleri is suspected.
- Early identification and appropriate treatment of Streptococcus milleri liver abscesses can improve patient outcomes.