Bacteriology of the chronically discharging middle ear

Area of Science:

• Microbiology
• Otolaryngology

Background:

• Chronic otitis media (COM) is a persistent middle ear infection.
• Bacteriological analysis of COM is crucial for effective treatment.

Purpose of the Study:

• To investigate the prevalence and types of anaerobic bacteria in chronically discharging middle ears.
• To correlate bacterial findings with clinical features and treatment history.

Main Methods:

• Bacteriological techniques were used to culture aerobic and anaerobic bacteria from 114 middle ear discharge samples.
• Gram staining was performed on 108 samples.
• Clinical data, including treatment and ear condition, were analyzed.

Main Results:

• Anaerobic bacteria were identified in 33% of cases, with Bacteroides being the most common genus.
• Aerobic bacteria, including staphylococci and gram-negative rods, were also prevalent.
• Anaerobic bacteria were more frequently found in ears with recurrent infections or suspected cholesteatoma.
• No significant differences in bacteriology were observed based on antimicrobial treatment or discharge volume.

Conclusions:

• Anaerobic bacteria are common in chronic otitis media, especially in complicated cases.
• Understanding the susceptibility of these anaerobes to antimicrobials and air is vital for therapeutic decisions.