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Polyclonal bacteremia due to gram-negative rods.

C Wendt1, W J Grunwald

  • 1Institut für Hygiene, Umweltmedizin, und Arbeitsmedizin, Freie Universität Berlin, Berlin, Germany. Constanze_Wendt@med.uni-heidelberg.de

Clinical Infectious Diseases : an Official Publication of the Infectious Diseases Society of America
|July 20, 2001
PubMed
Summary

Polyclonal gram-negative bacteremia, often caused by nonfermenting rods, occurred in 6.5% of patients. While complications were similar, these infections required more extensive antibiotic treatment.

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Area of Science:

  • Infectious Diseases
  • Microbiology
  • Clinical Medicine

Background:

  • Polyclonal gram-negative bacteremia remains poorly understood regarding its frequency, risk factors, and outcomes.
  • Gram-negative aerobic rods are common causes of bacteremia, but the distinction between monoclonal and polyclonal infections is critical.

Purpose of the Study:

  • To determine the frequency, risk factors, and outcomes of polyclonal gram-negative bacteremia.
  • To compare treatment and complications between polyclonal and monoclonal gram-negative bacteremia.

Main Methods:

  • Prospective cohort study of 153 patients with gram-negative aerobic rod bacteremia.
  • Pulsed field gel electrophoresis (PFGE) used to differentiate bacterial strains.
  • Episodes classified as polyclonal if >1 PFGE type of the same species was identified.

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Main Results:

  • Polyclonal bacteremia was identified in 10 (6.5%) patients.
  • Bacteremia caused by nonfermenting rods was the sole significant risk factor for polyclonal infection.
  • Nearly 20% of nonfermenting rod bacteremia episodes were polyclonal.
  • Complications were similar across monoclonal and polyclonal groups.
  • Patients with polyclonal bacteremia received more extensive antibiotic therapy.

Conclusions:

  • Nonfermenting gram-negative rods are a significant risk factor for polyclonal bacteremia.
  • Polyclonal bacteremia, though not associated with increased complications, necessitates more intensive antibiotic treatment.
  • Further research is needed to elucidate the mechanisms behind nonfermenting rods causing polyclonal bacteremia.