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Incidence, etiologic pathogens, and diagnostic testing of community-acquired pneumonia
1Department of Medicine, Northeastern Ohio Universities College of Medicine, Akron 44304, USA.
Abstract:
Determination of the etiologic pathogens of community-acquired pneumonia has been problematic because of the lack of reliable rapid laboratory diagnostic tools as well as the controversy concerning diagnostic criteria. In the studies reviewed here, a specific pathogen was identified in 39% to 88% of patients. Streptococcus pneumoniae remains the most common cause of community-acquired pneumonia. Depending on the demographics of the study, between 2% to 43% of cases have been attributed to legionella or Chlamydia pneumoniae. More recently, other pathogens have emerged, including respiratory syncytial virus in adults, hantavirus, and possibly legionella-like amoebal pathogens and Streptococcus milleri group. Treatment guidelines published by various societies of experts have been helpful, but they cannot replace the need for better and rapid diagnostic techniques.
Insights
Identifying the cause of community-acquired pneumonia is challenging due to diagnostic limitations. Streptococcus pneumoniae is the most frequent pathogen, but other bacteria and viruses are also implicated, highlighting the need for better diagnostic tools.
Area of Science:
- Infectious Diseases
- Microbiology
- Pulmonology
Background:
- Diagnosing etiologic pathogens in community-acquired pneumonia (CAP) is difficult.
- Lack of rapid diagnostic tools and unclear diagnostic criteria contribute to challenges.
Purpose of the Study:
- To review the current understanding of CAP pathogens.
- To highlight the limitations in current diagnostic methods for CAP.
Main Methods:
- Review of existing studies on CAP etiology.
- Analysis of pathogen identification rates and common causative agents.
Main Results:
- Pathogen identification rates in reviewed studies ranged from 39% to 88%.
- Streptococcus pneumoniae is the most common CAP pathogen.
- Legionella and Chlamydia pneumoniae account for 2-43% of cases, varying by demographics.
- Emerging pathogens include respiratory syncytial virus, hantavirus, and Legionella-like amoebal pathogens.
Conclusions:
- Current diagnostic methods for CAP are insufficient.
- Improved and rapid diagnostic techniques are essential for effective CAP management.
- While treatment guidelines exist, they cannot overcome diagnostic limitations.