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Research ArticleResearch and Reports

Mechanisms of Resistance for Streptococcus pyogenes in Northern Utah

Ryan A Rowe, Ryan M Stephenson, Destry L East and Scott Wright
American Society for Clinical Laboratory Science January 2009, 22 (1) 39-44; DOI: https://doi.org/10.29074/ascls.22.1.39
Ryan A Rowe
Clinical Laboratory Science Program, Department of Health Professions, Weber State University, Ogden UT
MLT(ASCP)
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Ryan M Stephenson
Clinical Laboratory Science Program, Department of Health Professions, Weber State University, Ogden UT
MLT (ASCP)
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Destry L East
Clinical Laboratory Science Program, Department of Health Professions, Weber State University, Ogden UT
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Scott Wright
associate professor of the Clinical Laboratory Science Program, Department of Health Professions, Weber State University, Ogden UT
MS CLS(M)(NCA)
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  • For correspondence: swright@weber.edu
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  1. Ryan A Rowe, MLT(ASCP)
    1. Clinical Laboratory Science Program, Department of Health Professions, Weber State University, Ogden UT
  2. Ryan M Stephenson, MLT (ASCP)
    1. Clinical Laboratory Science Program, Department of Health Professions, Weber State University, Ogden UT
  3. Destry L East, MLT (ASCP)
    1. Clinical Laboratory Science Program, Department of Health Professions, Weber State University, Ogden UT
  4. Scott Wright, MS CLS(M)(NCA)⇑
    1. associate professor of the Clinical Laboratory Science Program, Department of Health Professions, Weber State University, Ogden UT
  1. Address for correspondence: Scott Wright MS CLS(M)(NCA), associate professor, Clinical Laboratory Science Program, Department of Health Professions, Weber State University, 3905 University Circle, Ogden UT, 84408-3905. (801) 626-6716. swright{at}weber.edu.

Abstract

OBJECTIVE: The purpose of this study was to 1) determine the rates of penicillin and erythromycin resistance among Streptococcus pyogenes isolates in northern Utah, and 2) determine the genotype of the erythromycin resistant strains, thereby providing information regarding the mechanism of the resistance.

DESIGN: Seven hundred thirty-nine isolates of S. pyogenes were identified on 5% Sheep Blood Agar. Susceptibility to erythromycin and penicillin was performed using Muller-Hinton blood agar. All isolates resistant to erythromycin were then genotyped using PCR primers specific to one of the following: mefA gene, indicating the mechanism of resistance was an efflux pump; ermA gene, in which the mechanism was inducible methylation of the ribosomes; and ermB indicating constitutive methylation of the ribosomes.

LOCATION: This study was conducted at Weber State University, in the Department of Clinical Laboratory Sciences.

PATIENT SAMPLES: Samples were collected from 9 clinics ranging from North Ogden to Taylorsville, Utah. All samples were previously tested positive for S. pyogenes by the clinic from where the samples were collected.

RESULTS: Of the 739 S. pyogenes isolates tested, 2.4% were resistant to erythromycin with no resistance observed to penicillin. Of the strains that displayed some degree of resistance, the gene frequencies observed were as follows: 48.1% mefA, 26.0% ermA, 3.7% ermB, and 22.2% multiple genes.

CONCLUSION: The most common genotype was mefA, indicating that the efflux pump (M phenotype) is the most common mechanism in the surveyed area, followed by ermA, which produces the inducible methylating enzyme. A significant number of isolates was also observed to express both the efflux pump and the constitutive methylating enzyme.

ABBREVIATIONS: ATCC = American Type Culture Collection; CLS = clinical laboratory science; CLSI = Clinical Laboratory Standards Institute; IU = international unit; MLSB = macrolide, lincosamide, streptogrammin B; PCR = polymerase chain reaction; SBA= sheep blood agar; WSU = Weber State University.

    INDEX TERMS
  • erythromycin
  • erythromycin resistance mechanisms
  • PCR
  • penicillin
  • S. pyogenes
  • © Copyright 2009 American Society for Clinical Laboratory Science Inc. All rights reserved.
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American Society for Clinical Laboratory Science: 22 (1)
American Society for Clinical Laboratory Science
Vol. 22, Issue 1
Winter 2009
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Mechanisms of Resistance for Streptococcus pyogenes in Northern Utah
Ryan A Rowe, Ryan M Stephenson, Destry L East, Scott Wright
American Society for Clinical Laboratory Science Jan 2009, 22 (1) 39-44; DOI: 10.29074/ascls.22.1.39

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Mechanisms of Resistance for Streptococcus pyogenes in Northern Utah
Ryan A Rowe, Ryan M Stephenson, Destry L East, Scott Wright
American Society for Clinical Laboratory Science Jan 2009, 22 (1) 39-44; DOI: 10.29074/ascls.22.1.39
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Keywords

  • erythromycin
  • erythromycin resistance mechanisms
  • PCR
  • penicillin
  • S. pyogenes

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