Hidden Threats in Wild Testudines: Study Reveals Prevalence of Antibiotic-Resistant Escherichia coli

Strategic Insights -

Researchers at North-West University in Potchefstroom, South Africa, have uncovered concerning findings in the gut microbiota of wild Testudines, specifically bacteria that pose a threat to these reptilian species' health. The study investigated the occurrence, diversity, and virulence genes of Escherichia coli (E. coli) in 36 wild Testudines and 20 sediment samples from temporary and permanent water bodies at the Timbavati Private Nature Reserve. The research aimed to inform conservation and health management strategies for these species.

Key Takeaways:

  • The study found E. coli in 54% of 87 isolates, with virulence genes such as eaeA, virF, stx1, and stx2 detected in a significant proportion of isolates.
  • The E. coli isolates exhibited resistance to erythromycin (53%), cephalothin (48%), and spectinomycin (40%), indicating a high level of antibiotic resistance.
  • The presence of resistance genes such as mcr-4, bla, mcr-1, qnrA, mcr-2, and qnrD was also detected, further emphasizing the threat posed by these bacteria.
  • The findings suggest that wild Testudines harbor E. coli in their gut and that it also occurs in their surrounding environment.
  • The research highlights the complexity of host-microbial interactions and the influence of environmental and host factors on microbial diversity.
  • The study's authors emphasize the need for conservation and health management strategies to mitigate the impact of these bacteria on wild Testudines.

Statistics:

  • 54% of 87 isolates tested positive for E. coli.
  • E. coli isolates showed resistance to erythromycin in 53% of cases and cephalothin in 48% of cases.
  • Spectinomycin resistance was detected in 40% of isolates.
  • Virulence genes such as eaeA, virF, stx1, and stx2 were detected in 42%, 22%, 16%, and 3% of isolates, respectively.
  • Resistance genes such as mcr-4, bla, mcr-1, qnrA, mcr-2, and qnrD were detected in 70%, 46%, 42%, 16%, 22%, and 11% of isolates, respectively.

Sources:

  • Uncovering hidden threats: prevalence, antibiotic resistance and virulence gene profiles of Escherichia coli strains isolated from Testudines and their aquatic habitats. Molecular Biology Reports, 2025;52(1):778.
  • Springer, Van Godewijckstraat 30, 3311 Gz Dordrecht, Netherlands. (Springer - www.springer.com; Molecular Biology Reports - www.springerlink.com/content/0301-4851/)