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[Enterobacter amnigenus. An unusual human pathogen]

J A Capdevila1, V Bisbe, I Gasser

  • 1Servicio de Enfermedades Infecciosas, Hospital General Universitari Vall d'Hebron, Universitat Autònoma, Barcelona. janton@ar.vhebron.es

Enfermedades Infecciosas Y Microbiologia Clinica
|December 3, 1998
PubMed
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Enterobacter amnigenus, previously considered non-pathogenic, can cause documented human infections. This bacterium exhibits antimicrobial susceptibility patterns similar to Enterobacter cloacae.

Area of Science:

  • Clinical microbiology
  • Infectious diseases
  • Bacterial pathogenesis

Background:

  • Enterobacter amnigenus is a bacterium with uncertain pathogenic potential.
  • A case of documented E. amnigenus infection prompted a review of its clinical significance.

Observation:

  • A retrospective study analyzed 15 E. amnigenus isolates over 46 months.
  • Clinical data allowed classification of E. amnigenus as the definitive, probable, or improbable cause of infection in 7 patients.

Findings:

  • E. amnigenus was definitively linked to infection in 4 out of 7 evaluated patients.
  • High resistance rates were observed for ampicillin (83%) and cefazoline/cefoxitine (75%).
  • All isolates remained susceptible to third-generation cephalosporins, aztreonam, ciprofloxacin, cotrimoxazole, and aminoglycosides.

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Implications:

  • E. amnigenus should be recognized as a potential cause of bacterial infection, not merely a contaminant.
  • The clinical presentation and antibiotic susceptibility profile of E. amnigenus resemble those of Enterobacter cloacae.
  • This finding necessitates careful consideration of E. amnigenus in clinical diagnostics and treatment decisions.