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Antibiotic resistant beta-hemolytic streptococci.

Charmaine A C Lloyd1, Swarna E Jacob, Thangam Menon

  • 1Dr. A.L. Mudaliar Post Graduate Institute of Basic Medical Sciences, University of Madras, Chennai, India.

Indian Journal of Pediatrics
|January 5, 2008
PubMed
Summary
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Antibiotic resistance is emerging in beta-hemolytic streptococci, with Group A Streptococcus showing high resistance to tetracycline and erythromycin. However, penicillin and cephalosporins remain effective treatments.

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Antimicrobial Resistance

Background:

  • Beta-hemolytic streptococci, including Group A Streptococcus (GAS), Group G Streptococcus (GGS), and Group C Streptococcus (GCS), are significant human pathogens.
  • Understanding current antibiotic resistance patterns is crucial for effective treatment strategies.

Purpose of the Study:

  • To investigate the antibiotic sensitivity and emerging resistance trends in 117 strains of GAS, 60 strains of GGS, and 20 strains of GCS.
  • To identify specific antibiotics to which these streptococcal groups exhibit resistance.

Main Methods:

  • Utilized the Kirby Bauer disc diffusion method to test bacterial susceptibility to 15 different antibiotics.
  • Confirmed minimum inhibitory concentrations (MIC) for resistant strains using the broth dilution technique.

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Main Results:

  • Group A Streptococcus exhibited the highest resistance rates to tetracycline (27.4%) and erythromycin (16.2%).
  • Group G Streptococcus and Group C Streptococcus displayed comparable resistance patterns to those observed in GAS.
  • All tested beta-hemolytic streptococci remained susceptible to penicillin, amoxycillin, cephalosporins, and linezolid.

Conclusions:

  • Emerging resistance to erythromycin, tetracycline, clindamycin, chloramphenicol, and quinolones is a growing concern in beta-hemolytic streptococci.
  • Penicillin, amoxycillin, cephalosporins, and linezolid are currently reliable treatment options for infections caused by these bacteria.