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Polybacterial aetiology and outcomes in patients with community-acquired pneumonia

S Kumagai1, T Ishida1, H Tachibana1

  • 1Department of Respiratory Medicine, Ohara Memorial Kurashiki Healthcare Foundation, Kurashiki Central Hospital, Kurashiki, Japan.

The International Journal of Tuberculosis and Lung Disease : the Official Journal of the International Union Against Tuberculosis and Lung Disease
|December 22, 2015
PubMed
Abstract

Insights

Polybacterial community-acquired pneumonia (CAP) is linked to increased severity and higher 30-day mortality. Understanding these polymicrobial infections is crucial for improving patient outcomes in CAP cases.

Area of Science:

  • Infectious Diseases
  • Microbiology
  • Pulmonology

Background:

  • Community-acquired pneumonia (CAP) is a significant global health concern.
  • While bacterial interactions in the respiratory tract are known, the impact of multiple pathogens on CAP mortality remains unclear.

Purpose of the Study:

  • To determine the effect of polybacterial aetiology on mortality, prevalence, microbial patterns, and clinical features in CAP patients.
  • To identify predictors of polybacterial CAP and its association with disease severity and outcomes.

Main Methods:

  • Retrospective analysis of hospitalised CAP patient data.
  • Identification of bacterial aetiology, including monobacterial and polybacterial cases.
  • Multivariate analysis to assess predictors and mortality risk.

Main Results:

  • Bacterial aetiology was confirmed in 46.0% of 1544 CAP patients; 12.5% had polybacterial aetiology.
  • Streptococcus pneumoniae was the most common pathogen; S. pneumoniae and Haemophilus influenzae combination was most prevalent.
  • Polybacterial CAP was associated with higher severity and predicted 30-day mortality (OR 2.14).

Conclusions:

  • Polybacterial CAP is associated with increased disease severity.
  • Polybacterial aetiology is an independent predictor of adverse outcomes and mortality in CAP.

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