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Related Experiment Videos

Beta-hemolytic streptococci in advanced periodontitis

M J Flynn1, J Slots

  • 1University of Southern California, School of Dentistry, Los Angeles.

Oral Microbiology and Immunology
|October 1, 1993
PubMed
Summary

Beta-hemolytic streptococci were found in over a third of periodontitis patients, predominantly serotype F. These bacteria are sensitive to penicillin but resistant to other common antibiotics, potentially worsening periodontal disease.

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Area of Science:

  • Microbiology
  • Periodontology
  • Clinical Dentistry

Background:

  • Beta-hemolytic streptococci are implicated in various infections.
  • Periodontitis is a common inflammatory disease affecting the gums and supporting bone.

Purpose of the Study:

  • To investigate the prevalence and serotypes of beta-hemolytic streptococci in periodontitis patients.
  • To assess the antibiotic susceptibility of these bacteria.

Main Methods:

  • Subgingival plaque samples were collected from 718 periodontitis patients.
  • Samples were cultured anaerobically, and bacteria were identified and serotyped.
  • Antibiotic susceptibility testing was performed.

Main Results:

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  • Beta-hemolytic streptococci were recovered from 33.7% of patients, with serotype F being predominant (62.9%).
  • Prevalence was higher in patients aged 35 and older.
  • Organisms showed 100% sensitivity to penicillin but <5% sensitivity to tetracycline, metronidazole, and ciprofloxacin.

    • Conclusions:

    • Beta-hemolytic streptococci are present in periodontitis patients and may contribute to disease progression.
    • Antibiotic resistance patterns suggest penicillin as a primary treatment option.
    • Further research is needed to understand the role of these bacteria in periodontal inflammation and healing.