Antibiotic Resistance Among Enterococcal Isolates from Environmental and Clinical Sources.

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.