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Diagnostic test for etiologic agents of community-acquired pneumonia

John G Bartlett1

  • 1Division of Infectious Diseases, Department of Medicine, Johns Hopkins University School of Medicine, Johns Hopkins Hospital, 600 North Wolfe Street, Baltimore, MD 21205-2191, USA. jb@jhmi.edu

Infectious Disease Clinics of North America
|November 24, 2004
PubMed

Insights

Diagnostic testing for community-acquired pneumonia (CAP) is not typically recommended for outpatients, who often improve with empiric antibiotics. For hospitalized patients, specific tests like blood cultures and Legionella testing are advised, with new PCR tests on the horizon.

Area of Science:

  • Infectious Diseases
  • Microbiology
  • Clinical Diagnostics

Background:

  • Community-acquired pneumonia (CAP) diagnosis often lacks a specific etiologic agent identification in outpatients.
  • Empiric antibiotic therapy is common for CAP outpatients, often proving effective and cost-efficient compared to diagnostic tests.

Purpose of the Study:

  • To review current recommendations and emerging diagnostic strategies for identifying the causative agents of community-acquired pneumonia.
  • To guide the appropriate use of diagnostic tests in both outpatient and inpatient settings for CAP.

Main Methods:

  • Review of current clinical guidelines and diagnostic testing recommendations for CAP.
  • Discussion of established and novel diagnostic modalities, including blood cultures, sputum analysis, urinary antigen assays, and PCR.

Main Results:

  • Diagnostic tests are generally not recommended for most CAP outpatients.
  • For hospitalized CAP patients, pre-treatment blood cultures and sputum Gram stain/culture are recommended.
  • Testing for Legionella spp. is appropriate for severely ill hospitalized patients.
  • Emerging tests like urinary antigen assays for Streptococcus pneumoniae and PCR for Legionella pneumophila show promise for selected cases.

Conclusions:

  • Current diagnostic approaches for CAP vary significantly between outpatient and inpatient settings.
  • While empiric treatment is standard for outpatients, specific microbiological investigations are crucial for hospitalized individuals.
  • Advancements in molecular diagnostics, such as PCR, are expected to enhance etiological diagnosis for challenging CAP cases in the near future.

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