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Updated: Jul 5, 2026

Isolation and Identification of Waterborne Antibiotic-Resistant Bacteria and Molecular Characterization of their Antibiotic Resistance Genes
Published on: March 3, 2023
[Antibiotic resistance in enterococci isolated from gastrointestinal tract of long-livers]
Abstract:
The susceptibility of 47 antibiotics including 16 clinically important antibiotics was determined by the disk diffusion method for 58 enterococcal strains isolated from gastrointestinal tract of long-livers in 1978-1981. Among the isolates tested, no resistance to clinically relevant antibiotics was found in 9% of strains, 12% of strains demonstrated intermediate susceptibility to 1-6 clinically important antibiotics, and 79% of strains demonstrated resistance to 1-7 therapeutically important antibiotics.
Insights
Enterococcal strains from long-livers showed high resistance to many antibiotics. While 9% were susceptible, most strains exhibited intermediate or full resistance to therapeutically important antibiotics.
Area of Science:
- Microbiology
- Antimicrobial Resistance
- Gut Microbiome
Context:
- Enterococci are common gut bacteria.
- Long-lived populations may harbor unique microbial profiles.
- Antibiotic resistance is a growing global health concern.
Purpose:
- To assess the antibiotic susceptibility of enterococcal strains isolated from long-livers.
- To determine the prevalence of resistance to clinically important antibiotics in this population.
Summary:
- Antibiotic susceptibility testing was performed on 58 enterococcal strains from long-livers using the disk diffusion method.
- A wide range of 47 antibiotics, including 16 clinically significant ones, were tested.
- Results indicated that 79% of strains were resistant to 1-7 antibiotics, 12% showed intermediate susceptibility, and only 9% were fully susceptible to clinically relevant antibiotics.
Impact:
- This study provides baseline data on enterococcal antibiotic resistance in a unique population.
- Findings may inform strategies for managing infections in elderly or immunocompromised individuals.
- Highlights the potential for gut microbiota in long-livers to harbor antibiotic-resistant bacteria.
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Antibiotic Selection
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