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Nasopharyngeal lymphoid tissue--a threat to the middle ear?
1Department of Otolaryngology, Karolinska Institute, Huddinge Hospital, Sweden.
Insights
The nasopharynx hosts bacteria like Streptococcus pneumoniae, contributing to respiratory infections. Adenoidectomy may resolve secretory otitis media by altering the immune response to these microbes.
Area of Science:
- Microbiology
- Immunology
- Otolaryngology
Background:
- Upper respiratory tract infections involve microorganisms colonizing pharyngeal mucous membranes.
- The pediatric nasopharynx is a distinct niche, with Streptococcus pneumoniae and Haemophilus influenzae being key colonizers.
- These bacteria interact closely with the adenoid's lymphatic tissue.
Purpose of the Study:
- To investigate the interaction between nasopharyngeal microorganisms and adenoid lymphatic tissue.
- To understand the immunological mechanisms underlying the resolution of secretory otitis media post-adenoidectomy.
Main Methods:
- Microbiological analysis of nasopharyngeal flora.
- Histological examination of adenoid tissue.
- Immunological assays to assess host response.
Main Results:
- Specific bacterial species, including Streptococcus pneumoniae and Haemophilus influenzae, were identified in the nasopharynx.
- Evidence of microbial adherence to adenoid mucosa was observed.
- Studies suggest adenoidectomy's efficacy in secretory otitis media resolution is linked to immune response modulation rather than mechanical effects.
Conclusions:
- The nasopharynx harbors specific bacteria that interact with adenoid lymphoid tissue.
- Understanding this microbial-lymphatic interaction is crucial for addressing upper respiratory infections and related conditions like secretory otitis media.
Abstract:
Microorganisms responsible for upper respiratory tract infection reside on the mucous membranes of the pharynx, where distinct surfaces are selectively colonized. The nasopharynx in children can be considered a unique ecologic niche colonized, in comparison with the throat, with rather few bacterial species such as Streptococcus pneumoniae and Haemophilus influenzae. These bacteria adhere to the mucosa in close contact with the lymphatic tissue of the adenoid. Recently, several well-designed studies have shown statistically significant effect of adenoidectomy on the resolution of secretory otitis media. This effect does not seem to correlate to mechanical obstruction of the eustachian tube by the adenoid, but may be due to an increased antigenic load on the lymphatic tissue. It is therefore of interest to study the interaction between microorganisms and the lymphatic tissue.