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Updated: Aug 11, 2026

Non-Invasive Model of Neuropathogenic Escherichia coli Infection in the Neonatal Rat
Published on: October 29, 2014
Neonatal meningitis caused by Citrobacter koseri
Abstract:
Three cases of neonatal meningitis, two of which were fatal, occurred in a premature baby unit during a period of one week. A fourth case occurred in the same unit six months later. Citrobacter koseri was isolated from the cerebrospinal fluid of all four cases. Detailed biochemical and serological examination of the organisms showed that two distinct bioserotypes were involved.
Insights
Neonatal meningitis caused by Citrobacter koseri occurred in a premature baby unit, with two fatal cases. Investigations revealed two distinct strains of the bacterium, highlighting a potential outbreak.
Area of Science:
- Neonatalogy
- Infectious Diseases
- Microbiology
Background:
- Neonatal meningitis poses a significant threat to premature infants.
- Outbreaks of bacterial meningitis in neonatal intensive care units require prompt investigation.
Purpose of the Study:
- To report on a cluster of neonatal meningitis cases.
- To identify the causative agent and its characteristics.
Main Methods:
- Cerebrospinal fluid samples were collected from affected neonates.
- Bacterial isolates underwent detailed biochemical and serological analysis.
Main Results:
- Citrobacter koseri was identified as the causative agent in all four cases.
- Two distinct bioserotypes of Citrobacter koseri were identified.
- Two of the three initial cases were fatal.
Conclusions:
- Citrobacter koseri can cause severe neonatal meningitis outbreaks.
- The presence of distinct bioserotypes suggests a complex transmission or source.
- Effective infection control measures are crucial in neonatal units.
Related Concept Videos
Bacterial Meningitis
Viral Meningitis
Cryptococcal Meningitis
Bacterial Meningitis I: Introduction
Bacterial Meningitis II: Pathophysiology
Encephalitis l: Introduction

