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Related Experiment Videos

Do the beta-hemolytic non-group A streptococci cause pharyngitis?

N Cimolai1, R W Elford, L Bryan

  • 1Department of Microbiology and Infectious Diseases, Faculty of Medicine, University of Calgary, Alberta, Canada.

Reviews of Infectious Diseases
|May 1, 1988
PubMed
Summary
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Beta-hemolytic non-group A streptococci (BHNAS) are frequently found in throats but their role as pharyngeal pathogens requires further investigation. New genetic classifications necessitate re-examining BHNAS epidemiology and disease course.

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Epidemiology

Background:

  • Beta-hemolytic non-group A streptococci (BHNAS) are frequently isolated from human throats.
  • Their role as significant pharyngeal pathogens is often based on limited evidence like outbreaks and case clusters.
  • Previous studies noted BHNAS prevalence in both symptomatic and asymptomatic individuals across diverse populations.

Purpose of the Study:

  • To re-evaluate the epidemiological significance and disease course of BHNAS pharyngitis.
  • To address the need for further research into BHNAS as pharyngeal pathogens.
  • To acknowledge the impact of recent taxonomic and genetic advancements on understanding BHNAS.

Main Methods:

  • Laboratory studies highlighting optimal isolation techniques for BHNAS, including anaerobic atmosphere and prolonged incubation.

Related Experiment Videos

  • Genetic studies that have refined the taxonomy of BHNAS, defining major groups like Streptococcus anginosus-milleri group and large-colony BHNAS.
  • Serogrouping and biotyping for further classification within the large-colony BHNAS group.

    • Main Results:

    • BHNAS are a significant component of beta-hemolytic streptococcal isolates from throat cultures.
    • Laboratory methods like anaerobic incubation and extended culture periods enhance BHNAS detection.
    • Genetic and taxonomic studies have identified distinct groups within BHNAS, such as the Streptococcus anginosus-milleri group.

    Conclusions:

    • The diversity within BHNAS, clarified by recent genetic studies, warrants a re-examination of their role in pharyngeal infections.
    • Further epidemiological studies are needed to confirm BHNAS as established pharyngeal pathogens.
    • Future research should include treatment studies to validate the clinical significance of BHNAS infections.