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Direct Observation of Phagocytosis and NET-formation by Neutrophils in Infected Lungs using 2-photon Microscopy
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[Histological diagnosis of lung bacterial necrotizing infections: a study of four fulminant cases]

Sandra Lassalle1, Véronique Hofman, Catherine Butori

  • 1Laboratoire de Pathologie Clinique et Expérimentale, Hôpital Pasteur, BP 69, 06002 Nice Cedex.

Annales De Pathologie
|February 25, 2006
PubMed

Insights

Rapidly fatal pulmonary bacterial infections caused by Streptococcus, Staphylococcus, and Haemophilus influenzae present with extensive necrosis and minimal inflammation. Early diagnosis relies on combined histological and microbiological findings.

Area of Science:

  • Pulmonary Medicine
  • Pathology
  • Infectious Diseases

Background:

  • Reports on severe pulmonary bacterial infections with extensive necrosis are rare.
  • These infections can be rapidly fatal, occurring in both immunocompromised and immunocompetent individuals.
  • Necrotizing toxins produced by bacteria contribute to the severity of these conditions.

Observation:

  • Presents four cases of fatal pulmonary bacterial infections.
  • Infections were caused by group A Streptococcus, Staphylococcus aureus, and Haemophilus influenzae.
  • Patients succumbed within hours of symptom onset.

Findings:

  • Histopathology reveals extensive hemorrhagic necrosis and widespread bacterial presence.
  • Minimal to no inflammatory cell infiltration observed.
  • Distinctive features aid in differentiating from viral infections.

Implications:

  • Highlights the aggressive nature of specific bacterial lung infections.
  • Emphasizes the importance of prompt histological and microbiological diagnosis.
  • Crucial for identifying rare but lethal causes of acute respiratory failure.

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