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Group B beta-hemolytic streptococci causing pharyngitis.

J H Chretien, C G McGinniss, J Thompson

    Journal of Clinical Microbiology
    |September 1, 1979
    PubMed
    Summary
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    Group B beta-hemolytic streptococci can cause pharyngitis symptoms like enlarged tonsils and exudate. Definitive identification of these bacteria is crucial for accurate diagnosis and understanding their role in throat infections.

    Area of Science:

    • Microbiology
    • Infectious Diseases
    • Clinical Diagnostics

    Background:

    • Pharyngitis is commonly associated with Group A beta-hemolytic streptococci.
    • The pathogenic role of other beta-hemolytic streptococcal groups in pharyngitis is less understood.
    • Accurate identification of streptococcal species is essential for appropriate patient management.

    Purpose of the Study:

    • To investigate the clinical presentation of pharyngitis caused by Group B beta-hemolytic streptococci.
    • To determine the association between Group B beta-hemolytic streptococci and specific pharyngitis symptoms.
    • To advocate for comprehensive identification of beta-hemolytic streptococci in throat cultures.

    Main Methods:

    • Throat cultures were performed on 1,110 patients presenting with pharyngitis.

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  • Beta-hemolytic streptococci were identified and grouped.
  • Clinical symptoms including tonsillar enlargement, exudate, and lymphadenopathy were recorded and compared between groups.

    • Main Results:

    • Group B beta-hemolytic streptococci were isolated from 49 patients (4.4%).
    • Patients with Group B isolates were significantly more likely to exhibit enlarged tonsils (P < 0.001), exudate (P < 0.02), and tender anterior cervical lymphadenopathy (P < 0.01) compared to those with negative cultures.
    • These findings suggest Group B can be a pathogen in pharyngitis.

    Conclusions:

    • Group B beta-hemolytic streptococci should be considered a potential cause of exudative pharyngitis.
    • Laboratories should perform definitive grouping of all beta-hemolytic streptococcal isolates.
    • Further research is needed to fully elucidate the role of non-Group A beta-hemolytic streptococci in pharyngitis.