Genetic variability of Shiga toxin-producing Escherichia coli strains isolated from Paraguayan cattle

Shiga toxin-producing Escherichia coli (STEC) can cause serious foodborne illnesses in humans. Cattle are a natural reservoir of STEC, and transmission to humans occurs through consuming contaminated food, direct contact between humans and animals, and from person to person through the fecal-oral ro...

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Published inMicrobiology spectrum p. e0059625
Main Authors Salinas, Claudia, Rodriguez, Fátima, Muñoz-Barrera, Adrián, Lorenzo Salazar, José Miguel, González-Montelongo, Rafaela, Flores, Carlos, Guillén, Rosa
Format Journal Article
LanguageEnglish
Published United States American Society for Microbiology 14.08.2025
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ISSN2165-0497
2165-0497
DOI10.1128/spectrum.00596-25

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Abstract Shiga toxin-producing Escherichia coli (STEC) can cause serious foodborne illnesses in humans. Cattle are a natural reservoir of STEC, and transmission to humans occurs through consuming contaminated food, direct contact between humans and animals, and from person to person through the fecal-oral route. This study analyzed the genetic variability of STEC strains from cattle in Paraguay. The findings highlight the genetic diversity of STEC in Paraguay and emphasize the need for continued monitoring, as livestock play a key role in the country's economy. Applying genomic surveillance can help improve food safety, prevent outbreaks, and protect public health.
AbstractList Escherichia coli is a commensal of the intestinal microbiota; however, there are pathogenic strains associated with both intestinal and extraintestinal conditions. One of these pathotypes is Shiga toxin-producing E. coli (STEC), which can cause diarrhea, hemorrhagic colitis, and hemolytic uremic syndrome and has cattle as one of its main reservoirs. This study aimed to characterize genomes of STEC strains isolated from rectal swabs of cattle from ranches in the departments of San Pedro, Cordillera, Caaguazú, Paraguarí, and Villa Hayes in Paraguay. The previous characterization of the isolates and their classification as STEC were carried out by conventional PCR to identify the presence of the stx1 and stx2 genes. Here, whole genome sequencing was performed on 40 strains in total (38 STEC and 2 non-STEC) using the Illumina MiSeq platform. The presence of 27 different virulence profiles and 34 different serotypes was detected. Regarding antibiotic resistance, the fosA7 gene related to fosfomycin resistance was detected in 10% of the strains (n = 4), and the sitABCD gene related to hydrogen peroxide resistance in 2.5% (n = 1). Twenty-nine sequence types were detected, with ST58 (n = 3) and ST11729 (n = 3) being the most frequent. Most of the strains belong to phylogroup B1. This is the first report on the genetic variability of STEC strains isolated from cattle in Paraguay. Given the importance of livestock in the country's economy, epidemiological surveillance of pathogenic strains should continue to be carried out.Escherichia coli is a commensal of the intestinal microbiota; however, there are pathogenic strains associated with both intestinal and extraintestinal conditions. One of these pathotypes is Shiga toxin-producing E. coli (STEC), which can cause diarrhea, hemorrhagic colitis, and hemolytic uremic syndrome and has cattle as one of its main reservoirs. This study aimed to characterize genomes of STEC strains isolated from rectal swabs of cattle from ranches in the departments of San Pedro, Cordillera, Caaguazú, Paraguarí, and Villa Hayes in Paraguay. The previous characterization of the isolates and their classification as STEC were carried out by conventional PCR to identify the presence of the stx1 and stx2 genes. Here, whole genome sequencing was performed on 40 strains in total (38 STEC and 2 non-STEC) using the Illumina MiSeq platform. The presence of 27 different virulence profiles and 34 different serotypes was detected. Regarding antibiotic resistance, the fosA7 gene related to fosfomycin resistance was detected in 10% of the strains (n = 4), and the sitABCD gene related to hydrogen peroxide resistance in 2.5% (n = 1). Twenty-nine sequence types were detected, with ST58 (n = 3) and ST11729 (n = 3) being the most frequent. Most of the strains belong to phylogroup B1. This is the first report on the genetic variability of STEC strains isolated from cattle in Paraguay. Given the importance of livestock in the country's economy, epidemiological surveillance of pathogenic strains should continue to be carried out.Shiga toxin-producing Escherichia coli (STEC) can cause serious foodborne illnesses in humans. Cattle are a natural reservoir of STEC, and transmission to humans occurs through consuming contaminated food, direct contact between humans and animals, and from person to person through the fecal-oral route. This study analyzed the genetic variability of STEC strains from cattle in Paraguay. The findings highlight the genetic diversity of STEC in Paraguay and emphasize the need for continued monitoring, as livestock play a key role in the country's economy. Applying genomic surveillance can help improve food safety, prevent outbreaks, and protect public health.IMPORTANCEShiga toxin-producing Escherichia coli (STEC) can cause serious foodborne illnesses in humans. Cattle are a natural reservoir of STEC, and transmission to humans occurs through consuming contaminated food, direct contact between humans and animals, and from person to person through the fecal-oral route. This study analyzed the genetic variability of STEC strains from cattle in Paraguay. The findings highlight the genetic diversity of STEC in Paraguay and emphasize the need for continued monitoring, as livestock play a key role in the country's economy. Applying genomic surveillance can help improve food safety, prevent outbreaks, and protect public health.
Escherichia coli is a commensal of the intestinal microbiota; however, there are pathogenic strains associated with both intestinal and extraintestinal conditions. One of these pathotypes is Shiga toxin-producing E. coli (STEC), which can cause diarrhea, hemorrhagic colitis, and hemolytic uremic syndrome and has cattle as one of its main reservoirs. This study aimed to characterize genomes of STEC strains isolated from rectal swabs of cattle from ranches in the departments of San Pedro, Cordillera, Caaguazú, Paraguarí, and Villa Hayes in Paraguay. The previous characterization of the isolates and their classification as STEC were carried out by conventional PCR to identify the presence of the stx1 and stx2 genes. Here, whole genome sequencing was performed on 40 strains in total (38 STEC and 2 non-STEC) using the Illumina MiSeq platform. The presence of 27 different virulence profiles and 34 different serotypes was detected. Regarding antibiotic resistance, the fosA7 gene related to fosfomycin resistance was detected in 10% of the strains (n = 4), and the sitABCD gene related to hydrogen peroxide resistance in 2.5% (n = 1). Twenty-nine sequence types were detected, with ST58 (n = 3) and ST11729 (n = 3) being the most frequent. Most of the strains belong to phylogroup B1. This is the first report on the genetic variability of STEC strains isolated from cattle in Paraguay. Given the importance of livestock in the country’s economy, epidemiological surveillance of pathogenic strains should continue to be carried out.IMPORTANCEShiga toxin-producing Escherichia coli (STEC) can cause serious foodborne illnesses in humans. Cattle are a natural reservoir of STEC, and transmission to humans occurs through consuming contaminated food, direct contact between humans and animals, and from person to person through the fecal-oral route. This study analyzed the genetic variability of STEC strains from cattle in Paraguay. The findings highlight the genetic diversity of STEC in Paraguay and emphasize the need for continued monitoring, as livestock play a key role in the country's economy. Applying genomic surveillance can help improve food safety, prevent outbreaks, and protect public health.
is a commensal of the intestinal microbiota; however, there are pathogenic strains associated with both intestinal and extraintestinal conditions. One of these pathotypes is Shiga toxin-producing (STEC), which can cause diarrhea, hemorrhagic colitis, and hemolytic uremic syndrome and has cattle as one of its main reservoirs. This study aimed to characterize genomes of STEC strains isolated from rectal swabs of cattle from ranches in the departments of San Pedro, Cordillera, Caaguazú, Paraguarí, and Villa Hayes in Paraguay. The previous characterization of the isolates and their classification as STEC were carried out by conventional PCR to identify the presence of the and genes. Here, whole genome sequencing was performed on 40 strains in total (38 STEC and 2 non-STEC) using the Illumina MiSeq platform. The presence of 27 different virulence profiles and 34 different serotypes was detected. Regarding antibiotic resistance, the gene related to fosfomycin resistance was detected in 10% of the strains ( = 4), and the gene related to hydrogen peroxide resistance in 2.5% ( = 1). Twenty-nine sequence types were detected, with ST58 ( = 3) and ST11729 ( = 3) being the most frequent. Most of the strains belong to phylogroup B1. This is the first report on the genetic variability of STEC strains isolated from cattle in Paraguay. Given the importance of livestock in the country's economy, epidemiological surveillance of pathogenic strains should continue to be carried out. Shiga toxin-producing (STEC) can cause serious foodborne illnesses in humans. Cattle are a natural reservoir of STEC, and transmission to humans occurs through consuming contaminated food, direct contact between humans and animals, and from person to person through the fecal-oral route. This study analyzed the genetic variability of STEC strains from cattle in Paraguay. The findings highlight the genetic diversity of STEC in Paraguay and emphasize the need for continued monitoring, as livestock play a key role in the country's economy. Applying genomic surveillance can help improve food safety, prevent outbreaks, and protect public health.
Shiga toxin-producing Escherichia coli (STEC) can cause serious foodborne illnesses in humans. Cattle are a natural reservoir of STEC, and transmission to humans occurs through consuming contaminated food, direct contact between humans and animals, and from person to person through the fecal-oral route. This study analyzed the genetic variability of STEC strains from cattle in Paraguay. The findings highlight the genetic diversity of STEC in Paraguay and emphasize the need for continued monitoring, as livestock play a key role in the country's economy. Applying genomic surveillance can help improve food safety, prevent outbreaks, and protect public health.
Author González-Montelongo, Rafaela
Lorenzo Salazar, José Miguel
Guillén, Rosa
Rodriguez, Fátima
Muñoz-Barrera, Adrián
Flores, Carlos
Salinas, Claudia
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Keywords cattle
Shiga toxin
Paraguay
Escherichia coli
whole-genome sequencing
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Snippet Shiga toxin-producing Escherichia coli (STEC) can cause serious foodborne illnesses in humans. Cattle are a natural reservoir of STEC, and transmission to...
is a commensal of the intestinal microbiota; however, there are pathogenic strains associated with both intestinal and extraintestinal conditions. One of these...
Escherichia coli is a commensal of the intestinal microbiota; however, there are pathogenic strains associated with both intestinal and extraintestinal...
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SubjectTerms Epidemiology
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Title Genetic variability of Shiga toxin-producing Escherichia coli strains isolated from Paraguayan cattle
URI https://www.ncbi.nlm.nih.gov/pubmed/40810527
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