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September 10, 2025

Isolation of Shiga Toxin-Producing Escherichia coli from Sheep Fecal Samples: Bacteriological Findings

Key Points

The study found a high prevalence of STEC in sheep fecal samples, with 64.3% positivity overall.
In summertime, the prevalence of STEC peaked at 71.4%, indicating a seasonal variation in occurrences.
Antibiotic resistance was observed in sheep isolates, with many showing resistance to multiple antibiotics tested.
The average biosecurity scores for farms were significantly lower than global standards, highlighting potential risks.

Abstract

Shiga toxin-producing Escherichia coli (STEC) poses a significant public health risk due to its zoonotic potential and association with foodborne outbreaks. This study investigates the presence of STEC in fecal samples collected from sheep, focusing on bacteriological methods for isolation and preliminary characterization. Growth on selective agar showed 90 of 140 fecal samples were positive for STEC. The total average prevalence was 64.3% (95% CI 56.1 to 71.7%). The highest prevalence was 71.4% (54.9 to 83.7%) recorded in summertime, while the lowest was 51.4% (35.6 to 67%) in the autumn. Selected isolates were found to be resistant to commonly used antibiotics, with isolates expressing a resistant phenotype to two, three or more of the tested antibiotics. Based on the Biocheck.UGent system for risk-based assessment of farm biosecurity, the total, internal, and exterior average farm biosecurity scores were substantially lower than the world average.

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Cite This Study

Koleci et al. (Thu,) studied this question.

synapsesocial.com/papers/68c1a77a54b1d3bfb60e0b22 https://doi.org/https://doi.org/10.1099/acmi.0.001004.v2

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