A microbiological study of secretory otitis media using an anaerobic technique

Area of Science:

• Microbiology
• Otolaryngology
• Infectious Diseases

Background:

• Secretory otitis media (SOM) is a common condition, particularly in children, characterized by middle ear effusion.
• The role of anaerobic bacteria in the pathogenesis of chronic SOM remains unclear.
• Accurate sampling techniques are crucial for identifying causative agents in middle ear infections.

Purpose of the Study:

• To investigate the presence and types of anaerobic bacteria in middle ear effusions of patients with longstanding secretory otitis media.
• To determine if anaerobic bacteria contribute to the inflammatory process in SOM.

Main Methods:

• A stringent anaerobic sampling and cultivation technique was employed.
• Samples were obtained from 45 middle ear effusions in 30 patients diagnosed with longstanding SOM.
• Sterilization of the ear canal and tympanic membrane was performed prior to sample collection.

Main Results:

• Despite sterilization, 16% of samples showed contamination from the ear canal and tympanic membrane.
• Middle ear bacteria were identified in 30% of the remaining samples.
• Staphylococcus epidermidis and Haemophilus influenzae were the predominant aerobic bacteria found; anaerobes were only occasionally detected.
• Bacterial load was sparse in all positive samples.

Conclusions:

• The inflammatory process in longstanding secretory otitis media is unlikely to be maintained by anaerobic bacteria within the middle ear.
• Aerobic bacteria, such as Staphylococcus epidermidis and Haemophilus influenzae, are more commonly found in SOM effusions.
• Further research may focus on the role of aerobic bacteria or other non-bacterial factors in SOM pathogenesis.