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Updated: Aug 12, 2026

Identification of Rare Bacterial Pathogens by 16S rRNA Gene Sequencing and MALDI-TOF MS
Published on: July 11, 2016
Serratia odorifera biogroup I: an emerging pathogen
1Department of Medicine, Sisters of Charity Medical Center, Staten Island, NY, USA.
Abstract:
Gram-negative bacteremia is a common cause of infection in hospitalized patients. Serratia sepsis is known to cause clinically significant morbidity and mortality. The most common species involved is Serratia marcescens. Clinicians have been uncertain as to the role of Serratia odorifera biogroup 1 as a human pathogen because most isolates have not been associated with invasive disease. In previous publications, 12 cases have been described in which S odorifera biogroup 1 caused sepsis. These observations verify the organism's role as a human pathogen.
Insights
Serratia odorifera biogroup 1 can cause serious bloodstream infections (sepsis) in hospitalized patients, challenging previous assumptions about its role as a pathogen. This study confirms its capacity to induce invasive disease, impacting patient outcomes.
Area of Science:
- Medical Microbiology
- Infectious Diseases
- Clinical Bacteriology
Background:
- Gram-negative bacteremia poses a significant threat in hospital settings.
- Serratia sepsis contributes to substantial patient morbidity and mortality.
- Serratia marcescens is the most frequently implicated Serratia species in human infections.
Observation:
- Clinicians have questioned the pathogenicity of Serratia odorifera biogroup 1 due to limited association with invasive disease.
- Previous literature documented 12 cases of sepsis caused by Serratia odorifera biogroup 1.
- This study consolidates evidence regarding the clinical significance of this organism.
Findings:
- Serratia odorifera biogroup 1 is confirmed as a human pathogen capable of causing sepsis.
- The findings challenge the notion that Serratia odorifera biogroup 1 is solely a commensal or non-pathogenic organism.
- This research solidifies the understanding of Serratia species' diverse roles in healthcare-associated infections.
Implications:
- Healthcare providers should consider Serratia odorifera biogroup 1 in the differential diagnosis of Gram-negative sepsis.
- Enhanced surveillance and diagnostic strategies may be needed to identify infections caused by this pathogen.
- This study contributes to a more comprehensive understanding of Serratia-related sepsis and its clinical management.
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