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Community-acquired Moraxella catarrhalis pneumonia in previously healthy children

Magdalena G Sy1, Joan L Robinson

  • 1University of Alberta, Edmonton, Alberta, Canada.

Pediatric Pulmonology
|June 25, 2010
PubMed
Abstract

Insights

Moraxella catarrhalis is rarely a cause of community-acquired pneumonia (CAP) in healthy children, despite being common in upper respiratory secretions. Documented cases of M. catarrhalis CAP in previously well children are infrequent.

Area of Science:

  • Pediatric Infectious Diseases
  • Respiratory Medicine
  • Microbiology

Background:

  • Community-acquired pneumonia (CAP) is a significant pediatric illness.
  • Investigating the role of Moraxella catarrhalis in pediatric CAP is crucial for understanding disease etiology.
  • Focus on children without pre-existing chronic medical conditions.

Purpose of the Study:

  • Determine the prevalence of Moraxella catarrhalis as a cause of CAP in healthy children.
  • Describe the clinical characteristics of pediatric M. catarrhalis pneumonia.

Main Methods:

  • Systematic literature search for pediatric CAP case series and case reports.
  • Inclusion criteria: studies with diagnostic tests for M. catarrhalis or proven M. catarrhalis pneumonia in healthy children.
  • Analysis of diagnostic yields from various testing methods.

Main Results:

  • Nine case series included 1,500 children with CAP; M. catarrhalis detection varied by method (e.g., nasopharyngeal cultures 25%, nucleic acid amplification testing 2%).
  • Eight case reports identified M. catarrhalis pneumonia in previously healthy children (ages 3 weeks to 7 years).
  • Three-quarters of reported M. catarrhalis pneumonia cases required mechanical ventilation; all patients survived.

Conclusions:

  • Moraxella catarrhalis is frequently found in upper respiratory secretions of children with pneumonia.
  • Bacteremia and seroconversion due to M. catarrhalis are rare in pediatric CAP.
  • M. catarrhalis is an uncommon cause of CAP in previously healthy children, with no distinct clinical features identified.

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