Tags

Type your tag names separated by a space and hit enter

Identification of human-pathogenic strains of Shiga toxin-producing Escherichia coli from food by a combination of serotyping and molecular typing of Shiga toxin genes.
Appl Environ Microbiol. 2007 Aug; 73(15):4769-75.AE

Abstract

We examined 219 Shiga toxin-producing Escherichia coli (STEC) strains from meat, milk, and cheese samples collected in Germany between 2005 and 2006. All strains were investigated for their serotypes and for genetic variants of Shiga toxins 1 and 2 (Stx1 and Stx2). stx(1) or variant genes were detected in 88 (40.2%) strains and stx(2) and variants in 177 (80.8%) strains. Typing of stx genes was performed by stx-specific PCRs and by analysis of restriction fragment length polymorphisms (RFLP) of PCR products. Major genotypes of the Stx1 (stx(1), stx(1c), and stx(1d)) and the Stx2 (stx(2), stx(2d), stx(2-O118), stx(2e), and stx(2g)) families were detected, and multiple types of stx genes coexisted frequently in STEC strains. Only 1.8% of the STEC strains from food belonged to the classical enterohemorrhagic E. coli (EHEC) types O26:H11, O103:H2, and O157:H7, and only 5.0% of the STEC strains from food were positive for the eae gene, which is a virulence trait of classical EHEC. In contrast, 95 (43.4%) of the food-borne STEC strains carried stx(2) and/or mucus-activatable stx(2d) genes, an indicator for potential high virulence of STEC for humans. Most of these strains belonged to serotypes associated with severe illness in humans, such as O22:H8, O91:H21, O113:H21, O174:H2, and O174:H21. stx(2) and stx(2d) STEC strains were found frequently in milk and beef products. Other stx types were associated more frequently with pork (stx(2e)), lamb, and wildlife meat (stx(1c)). The combination of serotyping and stx genotyping was found useful for identification and for assignment of food-borne STEC to groups with potential lower and higher levels of virulence for humans.

Authors+Show Affiliations

National Reference Laboratory for Escherichia coli, Centre for Infectiology and Pathogen Characterization (4Z), Federal Institute for Risk Assessment (BfR), Diedersdorfer Weg 1, Berlin, Germany. l.beutin@bfr.bund.deNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Evaluation Study
Journal Article

Language

eng

PubMed ID

17557838

Citation

Beutin, Lothar, et al. "Identification of Human-pathogenic Strains of Shiga Toxin-producing Escherichia Coli From Food By a Combination of Serotyping and Molecular Typing of Shiga Toxin Genes." Applied and Environmental Microbiology, vol. 73, no. 15, 2007, pp. 4769-75.
Beutin L, Miko A, Krause G, et al. Identification of human-pathogenic strains of Shiga toxin-producing Escherichia coli from food by a combination of serotyping and molecular typing of Shiga toxin genes. Appl Environ Microbiol. 2007;73(15):4769-75.
Beutin, L., Miko, A., Krause, G., Pries, K., Haby, S., Steege, K., & Albrecht, N. (2007). Identification of human-pathogenic strains of Shiga toxin-producing Escherichia coli from food by a combination of serotyping and molecular typing of Shiga toxin genes. Applied and Environmental Microbiology, 73(15), 4769-75.
Beutin L, et al. Identification of Human-pathogenic Strains of Shiga Toxin-producing Escherichia Coli From Food By a Combination of Serotyping and Molecular Typing of Shiga Toxin Genes. Appl Environ Microbiol. 2007;73(15):4769-75. PubMed PMID: 17557838.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Identification of human-pathogenic strains of Shiga toxin-producing Escherichia coli from food by a combination of serotyping and molecular typing of Shiga toxin genes. AU - Beutin,Lothar, AU - Miko,Angelika, AU - Krause,Gladys, AU - Pries,Karin, AU - Haby,Sabine, AU - Steege,Katja, AU - Albrecht,Nadine, Y1 - 2007/06/08/ PY - 2007/6/15/pubmed PY - 2007/10/11/medline PY - 2007/6/15/entrez SP - 4769 EP - 75 JF - Applied and environmental microbiology JO - Appl Environ Microbiol VL - 73 IS - 15 N2 - We examined 219 Shiga toxin-producing Escherichia coli (STEC) strains from meat, milk, and cheese samples collected in Germany between 2005 and 2006. All strains were investigated for their serotypes and for genetic variants of Shiga toxins 1 and 2 (Stx1 and Stx2). stx(1) or variant genes were detected in 88 (40.2%) strains and stx(2) and variants in 177 (80.8%) strains. Typing of stx genes was performed by stx-specific PCRs and by analysis of restriction fragment length polymorphisms (RFLP) of PCR products. Major genotypes of the Stx1 (stx(1), stx(1c), and stx(1d)) and the Stx2 (stx(2), stx(2d), stx(2-O118), stx(2e), and stx(2g)) families were detected, and multiple types of stx genes coexisted frequently in STEC strains. Only 1.8% of the STEC strains from food belonged to the classical enterohemorrhagic E. coli (EHEC) types O26:H11, O103:H2, and O157:H7, and only 5.0% of the STEC strains from food were positive for the eae gene, which is a virulence trait of classical EHEC. In contrast, 95 (43.4%) of the food-borne STEC strains carried stx(2) and/or mucus-activatable stx(2d) genes, an indicator for potential high virulence of STEC for humans. Most of these strains belonged to serotypes associated with severe illness in humans, such as O22:H8, O91:H21, O113:H21, O174:H2, and O174:H21. stx(2) and stx(2d) STEC strains were found frequently in milk and beef products. Other stx types were associated more frequently with pork (stx(2e)), lamb, and wildlife meat (stx(1c)). The combination of serotyping and stx genotyping was found useful for identification and for assignment of food-borne STEC to groups with potential lower and higher levels of virulence for humans. SN - 0099-2240 UR - https://www.unboundmedicine.com/medline/citation/17557838/Identification_of_human_pathogenic_strains_of_Shiga_toxin_producing_Escherichia_coli_from_food_by_a_combination_of_serotyping_and_molecular_typing_of_Shiga_toxin_genes_ L2 - http://aem.asm.org/cgi/pmidlookup?view=long&pmid=17557838 DB - PRIME DP - Unbound Medicine ER -