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Legionnaires' disease

Burke A Cunha1, Almudena Burillo2, Emilio Bouza3

  • 1Infectious Disease Division, Winthrop-University Hospital, Mineola, NY, USA; School of Medicine, State University of New York, Stony Brook, NY, USA.

Lancet (London, England)
|August 2, 2015
PubMed

Insights

Legionella bacteria cause Legionnaires' disease, a severe pneumonia often linked to contaminated water systems. Increased awareness and diagnostic improvements are crucial for managing this potentially fatal infection.

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Public Health

Background:

  • Legionella bacteria, identified in 1977, are a significant cause of community-acquired pneumonia and a rare cause of hospital-acquired pneumonia.
  • These bacteria thrive in aquatic environments, including building water systems, and cause Legionnaires' disease, a severe multisystem infection primarily affecting vulnerable individuals.
  • The increasing prevalence of legionellosis may reflect enhanced disease recognition and reporting, alongside advancements in understanding its ecology and pathogenesis.

Purpose of the Study:

  • To review the current understanding of Legionnaires' disease, including its epidemiology, pathogenesis, and clinical manifestations.
  • To highlight challenges in diagnosis due to non-specific symptoms and limitations of current diagnostic tests.
  • To emphasize the importance of disease notification systems for outbreak control and the availability of effective antibiotic treatments.

Main Methods:

  • Literature review of Legionella and Legionnaires' disease.
  • Analysis of epidemiological trends and diagnostic challenges.
  • Synthesis of current knowledge on pathogenesis, clinical presentation, and management.

Main Results:

  • Legionella is a common cause of pneumonia, with increasing prevalence.
  • Susceptible populations are at higher risk due to factors like age and immunosuppression.
  • Diagnostic sensitivity remains a challenge, despite effective antibiotic treatments.

Conclusions:

  • Legionnaires' disease requires heightened clinical suspicion due to non-specific symptoms.
  • Effective surveillance and notification systems are vital for controlling outbreaks.
  • Continued research into diagnostics and pathogenesis is essential for improved patient outcomes.

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