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Clinical importance of polymicrobial bacteremia
Diagnostic Microbiology and Infectious Disease
|September 1, 1986
Summary
Polymicrobial bacteremia, involving multiple microbes, is linked to more severe outcomes and hospital-acquired infections compared to unimicrobial cases. Understanding these differences aids in diagnosing and treating sepsis effectively.
Area of Science:
- Infectious Diseases
- Microbiology
- Clinical Medicine
Background:
- Bacteremia and fungemia can be caused by a single or multiple microorganisms.
- Differences in clinical presentation and outcomes between these types of infections are not fully understood.
Purpose of the Study:
- To compare polymicrobial (multiple microbes) and unimicrobial (single microbe) bacteremia and fungemia.
- To identify distinct microbiological, epidemiological, and clinical features of each syndrome.
Main Methods:
- Retrospective comparison of 91 polymicrobial episodes with 407 unimicrobial episodes.
- Analysis of microbiological data, patient demographics, infection sources, and outcomes.
Main Results:
- Polymicrobial infections disproportionately featured Enterobacteriaceae, nongroup A streptococci, anaerobes, and pseudomonads.
- Polymicrobial episodes were more frequently hospital-acquired, originated from multiple sites or the bowel, and occurred in immunocompromised patients.
- Mortality directly related to sepsis was double in polymicrobial versus unimicrobial cases.
- Increased mortality in polymicrobial sepsis was associated with age >40, lack of fever, granulocytopenia, inadequate antimicrobial therapy, and specific infection sites.
Conclusions:
- Polymicrobial bacteremia presents unique microbiological and epidemiological characteristics.
- These infections are associated with higher mortality and specific risk factors.
- Identifying polymicrobial bacteremia can guide source identification and treatment strategies.