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Preliminary report on L-forms: possible role in the infectious origin of secretory otitis media
H Ataoglu1, N Goksu, Y K Kemaloglu
1Department of Clinical Microbiology, Ankara University School of Medicine, Turkey.
Abstract:
Infection and inflammation of the middle ear cleft are important factors in the pathogenesis of secretory otitis media. Although high percentages of negative cultures are confronted in many studies, strong evidence pointing to the infectious nature of this disease could not be overlooked. Many authors agree about the failure of conventional culture methods in identifying the responsible pathogen or pathogens. Besides, some agents, such as some kinds of antibiotics, lysozyme, and perhaps some undetected materials, are capable of changing bacterial behavior and consequently the clinical course. Effusions taken from 40 ears with secretory otitis media were cultured by means of conventional brain-heart infusion broth and special hypertonic thioglycollate broth. Strikingly, bacterial L-forms were detected in 6 specimens in thioglycollate broth, with no growth in the conventional broth. We concluded that these atypical forms of bacteria, the L-forms, may play an important role in the bacteriologic aspect of secretory otitis media.
Insights
Bacterial L-forms, atypical bacteria, were detected in secretory otitis media effusions using specialized cultures. These findings suggest L-forms may be crucial in the infectious causes of this common middle ear condition.
Area of Science:
- Otolaryngology
- Microbiology
- Infectious Diseases
Background:
- Secretory otitis media involves middle ear cleft infection and inflammation.
- Conventional culture methods often yield negative results, despite evidence of infectious etiology.
- Certain agents can alter bacterial behavior, complicating pathogen identification.
Purpose of the Study:
- To investigate the role of atypical bacterial forms in secretory otitis media.
- To compare conventional culture methods with specialized techniques for pathogen detection.
Main Methods:
- Middle ear effusions from 40 patients with secretory otitis media were analyzed.
- Cultures were performed using conventional brain-heart infusion broth.
- Specialized hypertonic thioglycollate broth was used for enhanced bacterial detection.
Main Results:
- Bacterial L-forms were identified in 6 specimens using hypertonic thioglycollate broth.
- No bacterial growth was observed in the conventional broth for these 6 specimens.
- This highlights the limitations of standard culture techniques.
Conclusions:
- Atypical bacterial forms, specifically L-forms, may be significant in the pathogenesis of secretory otitis media.
- Specialized culture methods are necessary to detect these elusive pathogens.
- Further research into L-forms' role in otitis media is warranted.