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Shigella.

H L DuPont1

  • 1University of Texas Medical School, Houston.

Infectious Disease Clinics of North America
|September 1, 1988
PubMed
Summary

Shigella bacteria cause illness using a plasmid for cell invasion, leading to severe diarrhea. Prompt diagnosis and treatment with antibiotics like TMP-SMX are crucial for managing shigellosis.

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Area of Science:

  • Microbiology
  • Infectious Diseases
  • Gastroenterology

Background:

  • Shigella strains harbor a 140-megadalton plasmid essential for epithelial cell penetration, a key virulence factor.
  • Shigellosis presents as a descending intestinal infection, characterized by severe diarrhea, fever, and bloody, mucus-laden stools.

Purpose of the Study:

  • To summarize the key characteristics of Shigella infection, including its pathogenesis, transmission, clinical presentation, and treatment.

Main Methods:

  • Review of existing literature on Shigella pathogenesis and clinical management.
  • Analysis of the role of the virulence plasmid in epithelial cell invasion.

Main Results:

  • A 140-megadalton plasmid is critical for Shigella's ability to penetrate epithelial cells.
  • Shigellosis is highly contagious, with as few as 200 cells causing infection.
  • Clinical suspicion is raised by severe diarrhea, fever, bloody stools, and fecal leukocytes.

Conclusions:

  • Effective treatment for shigellosis includes trimethoprim-sulfamethoxazole (TMP-SMX) or quinolones (norfloxacin, ciprofloxacin) in adults.
  • Understanding the plasmid-mediated virulence is key to combating Shigella infections.

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