title: Virulence characterization of non-O157 Shiga toxin-producing Escherichia coli isolates from food, humans and animals.
abstract: A total of 359 non-O157 STEC isolates from food, humans and animals were examined for serotypes, Shiga toxin subtypes and intimin subtypes. Isolates solely harboring stx2 from the three sources were selected for Vero cell cytotoxicity test. stx subtypes in eae negative isolates were more diverse than in eae positive isolates primarily carrying stx2a. Four eae subtypes (eaeβ,eaeε1,eaeγ1 and eaeγ2/θ) were observed and correlated with serotypes and flagella. Food isolates showed more diverse serotypes, virulence factors and cell cytotoxicities than human isolates. Some isolates from produce belonged to serotypes that have been implicated in human diseases, carried stx2a or/and stx2dact and exhibited high cell cytotoxicity similar to human isolates. This indicates that foods can be contaminated with potentially pathogenic STEC isolates that may cause human diseases. Given the increased produce consumption and growing burden of foodborne outbreaks due to produce, produce safety should be given great importance.
authors.affiliation: Technology Center of Zhangjiagang Entry-Exit Inspection & Quarantine Bureau of the People's Republic of China, Zhangjiagang, Jiangsu Province 215600, China; Department of Nutrition and Food Science, University of Maryland, College Park 20742, USA.
authors.forename: Jinling
authors.initials: J
authors.lastname: Shen
authors.affiliation: Department of Nutrition and Food Science, University of Maryland, College Park 20742, USA.
authors.forename: Lydia
authors.initials: L
authors.lastname: Rump
authors.affiliation: Department of Nutrition and Food Science, University of Maryland, College Park 20742, USA.
authors.forename: Wenting
authors.initials: W
authors.lastname: Ju
authors.affiliation: Technology Center of Zhangjiagang Entry-Exit Inspection & Quarantine Bureau of the People's Republic of China, Zhangjiagang, Jiangsu Province 215600, China.
authors.forename: Jingdong
authors.initials: J
authors.lastname: Shao
authors.affiliation: Center for Veterinary Medicine, U.S. Food and Drug Administration, Laurel, MD 20708, USA.
authors.forename: Shaohua
authors.initials: S
authors.lastname: Zhao
authors.affiliation: Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, College Park, MD 20740, USA.
authors.forename: Eric
authors.initials: E
authors.lastname: Brown
authors.affiliation: Department of Nutrition and Food Science, University of Maryland, College Park 20742, USA. Electronic address: jmeng@umd.edu.
authors.forename: Jianghong
authors.initials: J
authors.lastname: Meng
mesh_terms: D018829:Adhesins, Bacterial / Q000145:classification / Q000235:genetics; D000818:Animals; D002522:Chlorocebus aethiops; D029968:Escherichia coli Proteins / Q000145:classification / Q000235:genetics; D005407:Flagella; D005516:Food Microbiology; D059022:Food Safety; D005638:Fruit / Q000382:microbiology; D005838:Genotype; D006801:Humans; D008460:Meat / Q000382:microbiology; D012703:Serotyping; D022621:Shiga Toxin / Q000145:classification* / Q000235:genetics*; D054323:Shiga-Toxigenic Escherichia coli / Q000302:isolation & purification* / Q000472:pathogenicity*; D014675:Vegetables / Q000382:microbiology; D014709:Vero Cells; D014774:Virulence
chemical_list: D018829:Adhesins, Bacterial; D029968:Escherichia coli Proteins; C073819:eaeA protein, E coli; D022621:Shiga Toxin
keywords: STEC; Shiga toxin subtype; Vero cell cytotoxicity; eae subtype