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Respiratory infection: the disease.

H Lode

    Clinical Therapeutics
    |January 1, 1985
    PubMed
    Summary

    Pneumonia is lung inflammation caused by airborne pathogens. Bacterial pneumonia is common outside hospitals, while hospital-acquired infections involve diverse pathogens like gram-negative bacteria and fungi.

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    Area of Science:

    • Pulmonology
    • Infectious Diseases
    • Microbiology

    Background:

    • Infectious pneumonias involve lung inflammation, typically from airborne pathogens.
    • Distinguishing between bacterial/nonbacterial, community-acquired/hospital-acquired, and healthy/ill patients is crucial.
    • Pathogen prevalence varies by setting: pneumococci dominate community-acquired pneumonia, while hospitals see more gram-negative, anaerobic, and fungal agents.

    Purpose of the Study:

    • To differentiate infectious pneumonia types and their causative agents.
    • To highlight the epidemiological significance of viral upper respiratory tract infections.
    • To underscore the role of viral infections and impaired clearance in chronic bronchitis exacerbations.

    Main Methods:

    • Literature review and synthesis of existing data on pneumonia pathogens.
    • Analysis of pathogen distribution in community- versus hospital-acquired settings.
    • Examination of viral and bacterial roles in respiratory tract infections and bronchitis.

    Main Results:

    • Streptococcus pneumoniae remains the primary cause of community-acquired pneumonia.
    • Hospital-acquired pneumonia frequently involves gram-negative bacteria, anaerobes, and fungi.
    • Haemophilus influenzae and pneumococci are key pathogens in chronic bronchitis exacerbations.
    • Over 150 viral serotypes cause widespread upper respiratory tract infections, including rhinitis, pharyngitis, and bronchitis.

    Conclusions:

    • Understanding pathogen diversity is key to effective pneumonia treatment and prevention.
    • Viral infections significantly contribute to respiratory illnesses and can predispose to bacterial infections.
    • Public health strategies must address both bacterial and viral respiratory pathogens globally.

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