Tonsillar microbial flora: comparison of recurrent tonsillitis and normal tonsils

Area of Science:

• Microbiology
• Otolaryngology

Background:

• Recurrent group A streptococcal pharyngotonsillitis is a common condition.
• The role of tonsillar microbial flora in recurrent infections is not fully understood.
• Hypotheses include bacterial inactivation of antibiotics or loss of beneficial bacteria.

Purpose of the Study:

• To investigate the tonsillar microbial flora in patients with recurrent group A streptococcal tonsillitis compared to controls.
• To test the hypothesis that beta-lactamase-producing bacteria or reduced viridans streptococci contribute to recurrent tonsillitis.

Main Methods:

• Tonsillar core specimens were cultured from 34 patients undergoing tonsillectomy.
• Patients were divided into recurrent tonsillitis (n=17) and sleep apnea (control, n=17) groups.
• Semi-quantitative cultures assessed aerobic, anaerobic, and facultative organisms, including beta-lactamase producers and viridans streptococci.

Main Results:

• No significant differences were found in the mean number of aerobic or anaerobic isolates between the groups.
• The proportion of beta-lactamase producers and the frequency of viridans streptococci were similar in both recurrent tonsillitis and control groups.
• No significant differences in bacterial growth intensity were observed between the patient groups.

Conclusions:

• The study found no evidence to support the hypothesis that beta-lactamase-producing bacteria or altered viridans streptococci levels cause recurrent group A streptococcal tonsillitis.
• Alternative explanations, such as poor antibiotic penetration, warrant further investigation for recurrent tonsillitis treatment.