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

2025 · doi:10.1099/acmi.0.001004.v2
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This study examined the presence of Shiga toxin-producing Escherichia coli (STEC) in sheep fecal samples collected for bacteriological isolation and preliminary characterization, using growth on selective agar and a risk-based biosecurity assessment. Of 140 samples, 90 were positive for STEC, yielding an overall prevalence of 64.3% (95% CI 56.1–71.7%), with higher prevalence in summertime (71.4%) and lower in autumn (51.4%). Selected STEC isolates showed antibiotic resistance patterns, including resistance to two, three, or more commonly used antibiotics. The paper’s key limitation is that it reports isolation and preliminary characterization, with no deeper mechanistic or host-response analysis. The paper does not explicitly discuss endometriosis or adenomyosis; it was included in the corpus via a keyword match in the upstream search index.

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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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Full text loading... 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. - Received: - Version Posted: Funding - National Agency for Science Research and Inovation (Award No. 10, date 21.07.2023) - Principal Award Recipient: Xhelil KOLECI

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