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Related Experiment Videos

Microbiologic analyses of nasal polyp tissue.

S L Dunnette, M M Hall, J A Washington

    The Journal of Allergy and Clinical Immunology
    |July 1, 1986
    PubMed
    Summary

    Nasal polyps in asthma patients show significantly higher aerobic bacteria counts and diversity compared to non-asthma patients. Increased neutrophils in polyp tissue correlate directly with bacterial load.

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    Area of Science:

    • Microbiology
    • Immunology
    • Otolaryngology

    Background:

    • Nasal polyps are inflammatory sinonasal masses.
    • The role of microbial colonization in nasal polyp pathogenesis remains under investigation.

    Purpose of the Study:

    • To investigate the presence and types of microorganisms in nasal polyps.
    • To compare microbial findings between patients with and without asthma.
    • To assess the relationship between bacterial load, microbial diversity, and tissue neutrophilia.

    Main Methods:

    • Nasal polyp tissues from 40 patients were cultured for aerobic and anaerobic bacteria, viruses, fungi, mycoplasmas, and mycobacteria.
    • Quantitative bacterial cultures were performed, with results expressed as colony-forming units per gram (cfu/gm).

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  • Tissue neutrophilia was assessed and correlated with bacterial counts.

    • Main Results:

    • Aerobic bacteria were detected in 14 of 26 polyps from asthma patients versus 2 of 14 from non-asthma patients (p < 0.05).
    • Asthma patients exhibited a greater variety of aerobic bacterial species in their polyps (p < 0.01).
    • A strong positive correlation (r = +0.9; p < 0.001) was found between tissue neutrophilia and bacterial count.

    Conclusions:

    • Patients with asthma have a significantly higher prevalence and diversity of aerobic bacteria in nasal polyp tissue.
    • Bacterial colonization in nasal polyps is associated with increased neutrophil infiltration.
    • These findings suggest a role for aerobic bacteria in the inflammatory process of nasal polyps, particularly in asthmatic individuals.