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Antibiotic Resistance Among Enterococcal Isolates from Environmental and Clinical Sources

Linda M Knudtson1, Paul A Hartman1

  • 1Department of Microbiology, Immunology and Preventive Medicine, Iowa State University, Ames, Iowa 50011.

Journal of Food Protection
|May 16, 2019
PubMed

Insights

Antibiotic resistance in enterococci and fecal streptococci was studied across pork, water, and clinical sources. Most isolates showed limited resistance, with no multiple drug resistance found in key treatment antibiotics.

Area of Science:

  • Microbiology
  • Antimicrobial Resistance
  • Food Safety

Background:

  • Enterococci and fecal streptococci are significant bacteria found in various environments.
  • Understanding their antibiotic resistance patterns is crucial for public health and food safety.
  • Previous studies have indicated varying resistance levels across different sources.

Purpose of the Study:

  • To investigate and compare antibiotic resistance profiles of enterococci and fecal streptococci from pork, water, and clinical sources.
  • To identify specific resistance patterns among different enterococcal species.
  • To assess the prevalence of resistance to multiple antibiotics.

Main Methods:

  • Collected and tested 149 bacterial isolates from pork, water, and clinical materials.
  • Included 50 reference strains from 13 known species for comparison.
  • Evaluated resistance to 27 antimicrobial agents using MicroScan Pos MIC type 6 panels.

Main Results:

  • Pork isolates generally showed lower resistance to most antibiotics compared to water and clinical isolates.
  • A higher proportion of pork isolates were resistant to tetracycline.
  • Enterococcus faecium exhibited the highest resistance to beta-lactam antimicrobials, while Enterococcus faecalis showed resistance to antimicrobial combinations. Vancomycin resistance was noted in one isolate.
  • No enterococcal isolates displayed multiple drug resistance to common treatment antibiotics.

Conclusions:

  • Antibiotic resistance varies significantly among enterococci and fecal streptococci based on their source.
  • Specific enterococcal species possess distinct resistance mechanisms and patterns.
  • The absence of multiple drug resistance to critical antibiotics in this study is a positive finding, but continued surveillance is warranted.

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