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Rodwell EV, Simpson A, Chan YW, Godbole G, McCarthy ND, Jenkins C. The epidemiology of Shiga toxin-producing Escherichia coli O26:H11 (clonal complex 29) in England, 2014-2021. J Infect 2023; 86:552-562. [PMID: 37060924 DOI: 10.1016/j.jinf.2023.04.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2022] [Revised: 04/08/2023] [Accepted: 04/11/2023] [Indexed: 04/17/2023]
Abstract
OBJECTIVES We aimed to describe the genomic epidemiology of the foodborne gastrointestinal pathogen, Shiga toxin-producing Escherichia coli (STEC) serotype O26:H11 belonging to clonal complex 29 (CC29) in England. METHODS Between 01 January 2014 and 31 December 2021, 834 human isolates belonging to CC29 were sequenced at the UK Health Security Agency, and the genomic data was integrated with epidemiological data. RESULTS Diagnoses of STEC O26:H11 in England have increased each year from 19 in 2014 to 144 in 2021. Most isolates had the Shiga toxin subtype profiles stx1a (47%), stx1a,stx2a (n=24%) or stx2a (n=28%). Most cases were female (57%), and the highest proportion of cases belonged to the 0-5 age group (38%). Clinical symptoms included diarrhoea (93%), blood-stained stool (48%), and abdominal pain (74%). Haemolytic Uraemic Syndrome (HUS) was diagnosed in 40/459 (9%) cases and three children died. All isolates causing STEC-HUS had stx2a either alone (n=33) or in combination with stx1a (n=7). CONCLUSIONS STEC O26:H11 are a clinically significant, emerging threat to public health in England. Determining the true incidence and prevalence is challenging due to inconsistent national surveillance strategies. Improved diagnostics and surveillance algorithms are required to monitor the true burden, detect outbreaks and to implement effective interventions.
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Affiliation(s)
- Ella V Rodwell
- National Infection Service, UK Health Security Agency, 61 Colindale Avenue, London, NW9 5AT, UK; Warwick Medical School, University of Warwick, Coventry, CV4 7AL, UK; NIHR HPRU in Gastrointestinal Infections at University of Liverpool, UK
| | - Alex Simpson
- National Infection Service, UK Health Security Agency, 61 Colindale Avenue, London, NW9 5AT, UK
| | - Yung-Wai Chan
- National Infection Service, UK Health Security Agency, 61 Colindale Avenue, London, NW9 5AT, UK
| | - Gauri Godbole
- National Infection Service, UK Health Security Agency, 61 Colindale Avenue, London, NW9 5AT, UK
| | - Noel D McCarthy
- NIHR HPRU in Gastrointestinal Infections at University of Liverpool, UK
| | - Claire Jenkins
- National Infection Service, UK Health Security Agency, 61 Colindale Avenue, London, NW9 5AT, UK; NIHR HPRU in Gastrointestinal Infections at University of Liverpool, UK
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Co-infection with Fasciola hepatica may increase the risk of Escherichia coli O157 shedding in British cattle destined for the food chain. Prev Vet Med 2017; 150:70-76. [PMID: 29406086 PMCID: PMC5812777 DOI: 10.1016/j.prevetmed.2017.12.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Revised: 12/05/2017] [Accepted: 12/06/2017] [Indexed: 12/04/2022]
Abstract
Escherichia coli O157 is a zoonotic bacterium that can cause haemorrhagic diarrhoea in humans and is of worldwide public health concern. Cattle are considered to be the main reservoir for human infection. Fasciola hepatica is a globally important parasite of ruminant livestock that is known to modulate its host’s immune response and affect susceptibility to bacterial pathogens such as Salmonella Dublin. Shedding of E. coli O157 is triggered by unknown events, but the immune system is thought to play a part. We investigated the hypothesis that shedding of E. coli O157 is associated with F. hepatica infection in cattle. Three hundred and thirty four cattle destined for the food chain, from 14 British farms, were tested between January and October 2015. E. coli O157 was detected by immunomagnetic separation and bacterial load enumerated. F. hepatica infection status was assessed by copro-antigen ELISA. A significant association (p = 0.01) was found between the log percent positivity (PP) of the F. hepatica copro-antigen ELISA and E. coli O157 shedding when the fixed effects of day of sampling and the age of the youngest animal in the group, plus the random effect of farm were adjusted for. The results should be interpreted cautiously due to the lower than predicted level of fluke infection in the animals sampled. Nevertheless these results indicate that control of F. hepatica infection may have an impact on the shedding of E. coli O157 in cattle destined for the human food chain.
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Kraft AL, Lacher DW, Shelver WL, Sherwood JS, Bergholz TM. Comparison of immunomagnetic separation beads for detection of six non-O157 Shiga toxin-producing Escherichia coli serogroups in different matrices. Lett Appl Microbiol 2017; 65:213-219. [PMID: 28656639 DOI: 10.1111/lam.12771] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Revised: 06/21/2017] [Accepted: 06/22/2017] [Indexed: 11/30/2022]
Abstract
Immunomagnetic separation used with culture based methods has been a useful technique in the detection of pathogens. However, previous studies have not answered many of the necessary questions for real world applications. The objective of this study was to assess the efficacy of different immunomagnetic separation (IMS) bead types in recovery of the correct serogroup from a mixture of big six non-O157 Shiga toxin-producing Escherichia coli strains. To determine the impact of different matrices on recovery, samples of sterile phosphate buffered saline (PBS), sterile and non-sterile cattle faeces, ground beef and lettuce were inoculated with 10 CFU per ml mixture of isolates representing the six serogroups. After a 6 h incubation at 37°C, samples were mixed with IMS beads from three different commercial sources and plated on eosin methylene blue agar (EMB). Three suspect E. coli colonies were selected from each EMB plate and multiplex polymerase chain reaction was used to determine the serogroup. The rate of correct identification varied with the serogroup, IMS bead manufacturer and matrix. Overall, recovery of the correct serogroup became less likely with increase in matrix complexity, with enrichments containing lettuce having the greatest number of bead types with significantly lower likelihood of correct recovery compared to recovery in PBS. SIGNIFICANCE AND IMPACT OF THE STUDY The need to accurately and efficiently detect Shiga toxin-producing Escherichia coli (STEC) O26, O45, O103, O111, O121 and O145, which have caused outbreaks on numerous occasions, is a major public health and food safety concern in the United States. Detecting these STEC serogroups can be challenging because methods to detect non-O157 serogroups have not been refined as compared to those for O157. Immunomagnetic separation (IMS) has the potential to isolate STEC from a mixture in complex matrices. Our results highlight the need for optimization of IMS-based detection of STEC to effectively recover the targeted serogroup from a variety of sample matrices.
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Affiliation(s)
- A L Kraft
- Department of Microbiological Sciences, North Dakota State University, Fargo, ND, USA
| | - D W Lacher
- Division of Molecular Biology, United States Food and Drug Administration, Laurel, MD, USA
| | - W L Shelver
- Biosciences Research Laboratory, United States Department of Agriculture - Red River Valley Agricultural Research Service, Fargo, ND, USA
| | - J S Sherwood
- Department of Microbiological Sciences, North Dakota State University, Fargo, ND, USA
| | - T M Bergholz
- Department of Microbiological Sciences, North Dakota State University, Fargo, ND, USA
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Ranjbar R, Sheikhshahrokh A, Jonaidi Jafari N. Shiga (vero) toxin producingEscherichia coliin various types of food stuffs; virulence factors, O-serogroups and antimicrobial resistance properties. J Food Saf 2016. [DOI: 10.1111/jfs.12312] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- Reza Ranjbar
- Molecular Biology Research Center, Baqiyatallah University of Medical Sciences; Tehran Iran
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Iwu CJ, Iweriebor BC, Obi LC, Okoh AI. Occurrence of non-O157 Shiga toxin-producing Escherichia coli in two commercial swine farms in the Eastern Cape Province, South Africa. Comp Immunol Microbiol Infect Dis 2016; 44:48-53. [DOI: 10.1016/j.cimid.2015.12.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Revised: 12/11/2015] [Accepted: 12/17/2015] [Indexed: 12/28/2022]
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Mir RA, Weppelmann TA, Kang M, Bliss TM, DiLorenzo N, Lamb GC, Ahn S, Jeong KC. Association between animal age and the prevalence of Shiga toxin-producing Escherichia coli in a cohort of beef cattle. Vet Microbiol 2015; 175:325-31. [DOI: 10.1016/j.vetmic.2014.12.016] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Revised: 11/27/2014] [Accepted: 12/15/2014] [Indexed: 01/25/2023]
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Bibbal D, Loukiadis E, Kérourédan M, Ferré F, Dilasser F, Peytavin de Garam C, Cartier P, Oswald E, Gay E, Auvray F, Brugère H. Prevalence of carriage of Shiga toxin-producing Escherichia coli serotypes O157:H7, O26:H11, O103:H2, O111:H8, and O145:H28 among slaughtered adult cattle in France. Appl Environ Microbiol 2015; 81:1397-1405. [PMID: 25527532 PMCID: PMC4309698 DOI: 10.1128/aem.03315-14] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Accepted: 12/10/2014] [Indexed: 11/20/2022] Open
Abstract
The main pathogenic enterohemorrhagic Escherichia coli (EHEC) strains are defined as Shiga toxin (Stx)-producing E. coli (STEC) belonging to one of the following serotypes: O157:H7, O26:H11, O103:H2, O111:H8, and O145:H28. Each of these five serotypes is known to be associated with a specific subtype of the intimin-encoding gene (eae). The objective of this study was to evaluate the prevalence of bovine carriers of these “top five” STEC in the four adult cattle categories slaughtered in France. Fecal samples were collected from 1,318 cattle, including 291 young dairy bulls, 296 young beef bulls, 337 dairy cows, and 394 beef cows. A total of 96 E. coli isolates, including 33 top five STEC and 63 atypical enteropathogenic E. coli (aEPEC) isolates, with the same genetic characteristics as the top five STEC strains except that they lacked an stx gene, were recovered from these samples.O157:H7 was the most frequently isolated STEC serotype. The prevalence of top five STEC (all serotypes included) was 4.5% in young dairy bulls, 2.4% in young beef bulls, 1.8% in dairy cows, and 1.0% in beef cows. It was significantly higher in young dairy bulls (P<0.05) than in the other 3 categories. The basis for these differences between categories remains to be elucidated. Moreover,simultaneous carriage of STEC O26:H11 and STEC O103:H2 was detected in one young dairy bull. Lastly, the prevalence of bovine carriers of the top five STEC, evaluated through a weighted arithmetic mean of the prevalence by categories, was estimated to 1.8% in slaughtered adult cattle in France.
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Affiliation(s)
- Delphine Bibbal
- INSERM UMR1043, INRA USC1360, INP-ENVT ESC, Université de Toulouse, Toulouse, France
| | - Estelle Loukiadis
- Université de Lyon, VetAgro Sup, LMAP Laboratory, National Reference Laboratory for E. coli (Including VTEC), Marcy l'Etoile, France
- Université de Lyon, UMR 5557 Microbial Ecology, Université de Lyon 1, CNRS, VetAgro Sup, Research Group on Bacterial Opportunistic Pathogens and Environment, Villeurbanne, France
| | - Monique Kérourédan
- INSERM UMR1043, INRA USC1360, INP-ENVT ESC, Université de Toulouse, Toulouse, France
| | - Franck Ferré
- Université de Lyon, VetAgro Sup, LMAP Laboratory, National Reference Laboratory for E. coli (Including VTEC), Marcy l'Etoile, France
| | - Françoise Dilasser
- Université Paris-Est, Anses, Laboratory for Food Safety, Maisons-Alfort, France
| | | | | | - Eric Oswald
- INSERM UMR1043, INRA USC1360, CHU de Toulouse, Hôpital Purpan, Toulouse, France
| | - Emilie Gay
- Anses, Lyon Laboratory, Epidemiology Unit, Lyon, France
| | - Frédéric Auvray
- Université Paris-Est, Anses, Laboratory for Food Safety, Maisons-Alfort, France
| | - Hubert Brugère
- INSERM UMR1043, INRA USC1360, INP-ENVT ESC, Université de Toulouse, Toulouse, France
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Bonardi S, Alpigiani I, Tozzoli R, Vismarra A, Zecca V, Greppi C, Bacci C, Bruini I, Brindani F. Shiga toxin-producing Escherichia coli O157, O26 and O111 in cattle faeces and hides in Italy. Vet Rec Open 2015; 2:e000061. [PMID: 26392887 PMCID: PMC4567145 DOI: 10.1136/vetreco-2014-000061] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2014] [Revised: 09/17/2014] [Accepted: 11/24/2014] [Indexed: 11/20/2022] Open
Abstract
INTRODUCTION Ruminants are regarded as the natural reservoir for Shiga toxin-producing Escherichia coli (STEC), especially of serogroup O157. MATERIALS AND METHODS During 2011 and 2012, 320 samples (160 faecal samples from the rectum and 160 hide samples from the brisket area) were collected from 160 cattle at slaughter in Northern Italy during warm months (May to October). Cattle were reared in different farms and their age at slaughter ranged between nine months and 15 years, most of them being culled cattle (median age: six years; average age: 4.6 years). Samples were tested by immunomagnetic-separation technique for E coli O157 and O26 and by a screening PCR for stx genes followed by cultural detection of STEC. The virulence genes stx1, stx2, eae, and e-hlyA were detected and among stx2-positive isolates the presence of the stx2a and stx2c variants was investigated. RESULTS Twenty-one of 160 cattle (13.1 per cent; 95 per cent CI 8.3 to 19.4 per cent) were found to be faecal carriers of STEC. STEC O157 was found in 10 (6.3 per cent) samples, STEC O26 in six (3.8 per cent) and STEC O111 in one (0.6 per cent). Four isolates (2.5 per cent) were O not determined (OND). Six out of 160 (3.8 per cent; 95 per cent CI 1.4 to 8.0 per cent) hide samples were positive for STEC; four hides (2.5 per cent) were contaminated by STEC O157 and two (1.3 per cent) by STEC O26. In three cattle (1.9 per cent) STEC from both faeces and hides were detected. Among STEC O157, 87.5 per cent of them carried the stx2c gene and 12.5 per cent carried both stx1 and stx2c genes. No O157 isolate harboured stx2a variant. STEC O26 and O111 carried the stx1 gene only. One OND strain carried both the stx2a and stx2c genes. CONCLUSIONS This study shows that STEC O157 from cattle can harbour the stx2c variant, which is associated with haemolytic uraemic syndrome in humans, and that cattle hides may be a source of human pathogenic STEC O157 and O26 in the slaughterhouse environment.
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Affiliation(s)
- S Bonardi
- Department of Veterinary Science, Unit of Food Hygiene , University of Parma , Parma , Italy
| | - I Alpigiani
- Department of Veterinary Science, Unit of Food Hygiene , University of Parma , Parma , Italy
| | - R Tozzoli
- Department of Veterinary Public Health and Food Safety , Istituto Superiore di Sanità , Rome , Italy
| | - A Vismarra
- Department of Veterinary Science, Unit of Food Hygiene , University of Parma , Parma , Italy
| | - V Zecca
- Department of Veterinary Science, Unit of Food Hygiene , University of Parma , Parma , Italy
| | - C Greppi
- National Health Service, Veterinary Service, Local Unit of Cremona , Italy
| | - C Bacci
- Department of Veterinary Science, Unit of Food Hygiene , University of Parma , Parma , Italy
| | - I Bruini
- Department of Veterinary Science, Unit of Food Hygiene , University of Parma , Parma , Italy
| | - F Brindani
- Department of Veterinary Science, Unit of Food Hygiene , University of Parma , Parma , Italy
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Shahrani M, Dehkordi FS, Momtaz H. Characterization of Escherichia coli virulence genes, pathotypes and antibiotic resistance properties in diarrheic calves in Iran. Biol Res 2014; 47:28. [PMID: 25052999 PMCID: PMC4105491 DOI: 10.1186/0717-6287-47-28] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2014] [Accepted: 06/05/2014] [Indexed: 01/07/2023] Open
Abstract
Background Calf diarrhea is a major economic concern in bovine industry all around the world. This study was carried out in order to investigate distribution of virulence genes, pathotypes, serogroups and antibiotic resistance properties of Escherichia coli isolated from diarrheic calves. Results Totally, 76.45% of 824 diarrheic fecal samples collected from Isfahan, Chaharmahal, Fars and Khuzestan provinces, Iran were positive for E. coli and all of them were also positive for cnf2, hlyA, cdtIII, f17c, lt, st, stx1, eae, ehly, stx2 and cnf1 virulence genes. Chaharmahal had the highest prevalence of STEC (84.61%), while Isfahan had the lowest (71.95%). E. coli serogroups had the highest frequency in 1–7 days old calves and winter season. Distribution of ETEC, EHEC, AEEC and NTEC pathotypes among E. coli isolates were 28.41%, 5.07%, 29.52% and 3.49%, respectively. Statistical analyses were significant for presence of bacteria between various seasons and ages. All isolates had the high resistance to penicillin (100%), streptomycin (98.25%) and tetracycline (98.09%) antibiotics. The most commonly detected resistance genes were aadA1, sul1, aac[3]-IV, CITM, and dfrA1. The most prevalent serogroup among STEC was O26. Conclusions Our findings should raise awareness about antibiotic resistance in diarrheic calves in Iran. Clinicians should exercise caution when prescribing antibiotics.
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Cernicchiaro N, Renter DG, Cull CA, Paddock ZD, Shi X, Nagaraja TG. Fecal shedding of non-O157 serogroups of Shiga toxin-producing Escherichia coli in feedlot cattle vaccinated with an Escherichia coli O157:H7 SRP vaccine or fed a Lactobacillus-based direct-fed microbial. J Food Prot 2014; 77:732-7. [PMID: 24780326 DOI: 10.4315/0362-028x.jfp-13-358] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The objectives of this study were to determine whether fecal shedding of non-O157 Shiga toxin-producing Escherichia coli (STEC) in feedlot cattle was affected by the use of an E. coli O157:H7 vaccine or a direct-fed microbial (DFM) and whether the shedding of a particular non-O157 STEC serogroup within feces was associated with shedding of O157 or other non-O157 STEC serogroups. A total of 17,148 cattle in 40 pens were randomized to receive one, both, or neither (control) of the two interventions: a vaccine based on the siderophore receptor and porin proteins (E. coli SRP vaccine, two doses) and a DFM product (low-dose Bovamine). Fresh fecal samples (30 samples per pen) were collected weekly from pen floors for four consecutive weeks beginning approximately 56 days after study allocation. DNA extracted from enriched samples was tested for STEC O157 and non-O157 serogroups O26, O45, O103, O111, O121, and O145 and for four major virulence genes (stx1, stx2, eae, and ehxA) using an 11-gene multiplex PCR assay. Generalized linear mixed models were used to analyze the effects of treatments and make within-sample comparisons of the presence of O-serogroup-specific genes. Results of cumulative prevalence measures indicated that O157 (14.6%), O26 (10.5%), and O103 (10.3%) were the most prevalent STEC O serogroups. However, the vaccine, DFM, or both had no significant effect (P > 0.05) on fecal prevalence of the six non-O157 STEC serogroups in feedlot cattle. Within-sample comparisons of the presence of STEC serogroup-specific genes indicated that fecal shedding of E. coli O157 in cattle was associated with an increased probability (P < 0.05) of fecal shedding of STEC O26, O45, O103, and O121. Our study revealed that neither the E. coli O157:H7 vaccine, which reduced STEC O157 fecal shedding, nor the DFM significantly affected fecal shedding of non-O157 STEC serogroups, despite the fact that the most prevalent non-O157 STEC serogroups tended to occur concurrently with O157 STEC strains within fecal samples.
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Affiliation(s)
- N Cernicchiaro
- Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas 66505, USA
| | - D G Renter
- Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas 66505, USA.
| | - C A Cull
- Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas 66505, USA
| | - Z D Paddock
- Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas 66505, USA
| | - X Shi
- Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas 66505, USA
| | - T G Nagaraja
- Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas 66505, USA
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Paddock ZD, Renter DG, Cull CA, Shi X, Bai J, Nagaraja TG. Escherichia coliO26 in Feedlot Cattle: Fecal Prevalence, Isolation, Characterization, and Effects of anE. coliO157 Vaccine and a Direct-Fed Microbial. Foodborne Pathog Dis 2014; 11:186-93. [DOI: 10.1089/fpd.2013.1659] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Zac D. Paddock
- Department of Diagnostic Medicine and Pathobiology, Kansas State University, Manhattan, Kansas
| | - David G. Renter
- Department of Diagnostic Medicine and Pathobiology, Kansas State University, Manhattan, Kansas
| | - Charley A. Cull
- Department of Diagnostic Medicine and Pathobiology, Kansas State University, Manhattan, Kansas
| | - Xiarong Shi
- Department of Diagnostic Medicine and Pathobiology, Kansas State University, Manhattan, Kansas
| | - Jianfa Bai
- Veterinary Diagnostic Laboratory, Kansas State University, Manhattan, Kansas
| | - Tiruvoor G. Nagaraja
- Department of Diagnostic Medicine and Pathobiology, Kansas State University, Manhattan, Kansas
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12
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Intimin gene (eae) subtype-based real-time PCR strategy for specific detection of Shiga toxin-producing Escherichia coli serotypes O157:H7, O26:H11, O103:H2, O111:H8, and O145:H28 in cattle feces. Appl Environ Microbiol 2013; 80:1177-84. [PMID: 24296503 DOI: 10.1128/aem.03161-13] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Shiga toxin-producing Escherichia coli (STEC) strains belonging to serotypes O157:H7, O26:H11, O103:H2, O111:H8, and O145:H28 are known to be associated with particular subtypes of the intimin gene (eae), namely, γ1, β1, ε, θ, and γ1, respectively. This study aimed at evaluating the usefulness of their detection for the specific detection of these five main pathogenic STEC serotypes in cattle feces. Using real-time PCR assays, 58.7% of 150 fecal samples were found positive for at least one of the four targeted eae subtypes. The simultaneous presence of stx, eae, and one of the five O group markers was found in 58.0% of the samples, and the five targeted stx plus eae plus O genetic combinations were detected 143 times. However, taking into consideration the association between eae subtypes and O group markers, the resulting stx plus eae subtype plus O combinations were detected only 46 times. The 46 isolation assays performed allowed recovery of 22 E. coli strains belonging to one of the five targeted STEC serogroups. In contrast, only 2 of 39 isolation assays performed on samples that were positive for stx, eae and an O group marker, but that were negative for the corresponding eae subtype, were successful. Characterization of the 24 E. coli isolates showed that 6 were STEC, including 1 O157:H7, 3 O26:H11, and 2 O145:H28. The remaining 18 strains corresponded to atypical enteropathogenic E. coli (aEPEC). Finally, the more discriminating eae subtype-based PCR strategy described here may be helpful for the specific screening of the five major STEC in cattle feces.
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Cernicchiaro N, Cull CA, Paddock ZD, Shi X, Bai J, Nagaraja TG, Renter DG. Prevalence of Shiga Toxin–Producing Escherichia coli and Associated Virulence Genes in Feces of Commercial Feedlot Cattle. Foodborne Pathog Dis 2013; 10:835-41. [DOI: 10.1089/fpd.2013.1526] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Affiliation(s)
- Natalia Cernicchiaro
- Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas
| | - Charley A. Cull
- Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas
| | - Zachary D. Paddock
- Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas
| | - Xiaorong Shi
- Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas
| | - Jianfa Bai
- Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas
| | - Tiruvoor G. Nagaraja
- Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas
| | - David G. Renter
- Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas
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Wang F, Yang Q, Kase JA, Meng J, Clotilde LM, Lin A, Ge B. Current trends in detecting non-O157 Shiga toxin-producing Escherichia coli in food. Foodborne Pathog Dis 2013; 10:665-77. [PMID: 23755895 DOI: 10.1089/fpd.2012.1448] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Non-O157 Shiga toxin-producing Escherichia coli (non-O157 STEC) strains are increasingly recognized as important foodborne pathogens worldwide. Together with E. coli O157:H7, six additional STEC serogroups (O26, O45, O103, O111, O121, and O145) are now regulated as adulterants in certain raw beef products in the United States. However, effective detection and isolation of non-O157 STEC strains from food matrices remain challenging. In the past decade, great attention has been paid to developing rapid and reliable detection methods for STEC in general (targeting common virulence factors) and specific STEC serogroups in particular (targeting serogroup-specific traits). This review summarizes current trends in detecting non-O157 STEC in food, including culture, immunological, and molecular methods, as well as several novel technologies.
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Affiliation(s)
- Fei Wang
- Department of Food Science, Louisiana State University Agricultural Center , Baton Rouge, Louisiana, USA
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Tomat D, Migliore L, Aquili V, Quiberoni A, Balagué C. Phage biocontrol of enteropathogenic and shiga toxin-producing Escherichia coli in meat products. Front Cell Infect Microbiol 2013; 3:20. [PMID: 23761050 PMCID: PMC3674477 DOI: 10.3389/fcimb.2013.00020] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2012] [Accepted: 05/22/2013] [Indexed: 11/13/2022] Open
Abstract
Ten bacteriophages were isolated from faeces and their lytic effects assayed on 103 pathogenic and non-pathogenic Enterobacteriaceae. Two phages (DT1 and DT6) were selected based on their host ranges, and their lytic effects on pathogenic E. coli strains inoculated on pieces of beef were determined. We evaluated the reductions of viable cells of Escherichia coli O157:H7 and non-O157 Shiga toxigenic E. coli strains on meat after exposure to DT6 at 5 and 24°C for 3, 6, and 24 h and the effect of both phages against an enteropathogenic E. coli strain. Significant viable cell reductions, compared to controls without phages, at both temperatures were observed, with the greatest decrease taking place within the first hours of the assays. Reductions were also influenced by phage concentration, being the highest concentrations, 1.7 × 1010 plaque forming units per milliliter (PFU/mL) for DT1 and 1.4 × 1010 PFU/mL for DT6, the most effective. When enteropathogenic E. coli and Shiga toxigenic E. coli (O157:H7) strains were tested, we obtained viable cell reductions of 0.67 log (p = 0.01) and 0.77 log (p = 0.01) after 3 h incubation and 0.80 log (p = 0.01) and 1.15 log (p = 0.001) after 6 h. In contrast, all nonpathogenic E. coli strains as well as other enterobacteria tested were resistant. In addition, phage cocktail was evaluated on two strains and further reductions were observed. However, E. coli bacteriophage insensitive mutants (BIMs) emerged in meat assays. BIMs isolated from meat along with those isolated by using the secondary culture method were tested to evaluate resistance phenotype stability and reversion. They presented low emergence frequencies (6.5 × 10−7–1.8 × 10−6) and variable stability and reversion. Results indicate that isolated phages were stable on storage, negative for all the virulence factors assayed, presented lytic activity for different E. coli virotypes and could be useful in reducing Shiga toxigenic E. coli and enteropathogenic E. coli viable cells in meat products.
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Affiliation(s)
- David Tomat
- Área de Bacteriología, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario Rosario, Argentina.
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Farrokh C, Jordan K, Auvray F, Glass K, Oppegaard H, Raynaud S, Thevenot D, Condron R, De Reu K, Govaris A, Heggum K, Heyndrickx M, Hummerjohann J, Lindsay D, Miszczycha S, Moussiegt S, Verstraete K, Cerf O. Review of Shiga-toxin-producing Escherichia coli (STEC) and their significance in dairy production. Int J Food Microbiol 2013; 162:190-212. [DOI: 10.1016/j.ijfoodmicro.2012.08.008] [Citation(s) in RCA: 179] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Revised: 07/31/2012] [Accepted: 08/01/2012] [Indexed: 01/08/2023]
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Momtaz H, Farzan R, Rahimi E, Safarpoor Dehkordi F, Souod N. Molecular characterization of Shiga toxin-producing Escherichia coli isolated from ruminant and donkey raw milk samples and traditional dairy products in Iran. ScientificWorldJournal 2012; 2012:231342. [PMID: 22919299 PMCID: PMC3419413 DOI: 10.1100/2012/231342] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2012] [Accepted: 07/04/2012] [Indexed: 01/08/2023] Open
Abstract
The aims of the current study were to detect the virulence factors and antibiotic resistance of Shiga toxin-producing E. coli, in animal milk and dairy products in Iran. After E. coli dentification with culture method, PCR assay were developed for detection of pathogenic genes, serotypes and antibiotic resistance genes of E. coli. Results showed that out of 719 samples, 102 (14.18%) were confirmed to be positive for E. coli and out of 102 positive samples, 17.64% were O26 and 13.72% were O157 and 1.96% were O91 and 1.96% were O145 serotypes. Totally, the prevalence of stx1 and papA genes were the highest while the prevalence of sfaS and fyuA were the lowest in the positive samples. PCR results showed that tetA, tetB were the highest (64.70%) and aac(3)-IV were the lowest (27.45%) antibiotic resistant genes in E. coli positive samples. Our study indicated that the isolated E. coli trains in these regions had a highest antibiotic resistance to tetracycline (58.82%) and the lowest to nitrofurantoin (3.92%). tetA gene and E. coli O157 serotype had highest and aac(3)-IV gene, and E. coli O145 serotype had a lowest frequency rates of antibiotics resistance genes, in the region.
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Affiliation(s)
- Hassan Momtaz
- Department of Microbiology, College of Veterinary Medicine, Islamic Azad University, Shahrekord Branch, Shahrekord 166, Iran.
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Bai J, Paddock ZD, Shi X, Li S, An B, Nagaraja TG. Applicability of a Multiplex PCR to Detect the Seven Major Shiga Toxin–ProducingEscherichia coliBased on Genes That Code for Serogroup-Specific O-Antigens and Major Virulence Factors in Cattle Feces. Foodborne Pathog Dis 2012; 9:541-8. [DOI: 10.1089/fpd.2011.1082] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Jianfa Bai
- Veterinary Diagnostic Laboratory, Kansas State University, Manhattan, Kansas
- Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, Kansas
| | - Zachary D. Paddock
- Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, Kansas
| | - Xiaorong Shi
- Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, Kansas
| | - Shubo Li
- Veterinary Diagnostic Laboratory, Kansas State University, Manhattan, Kansas
- Liaoning Center for Animal Epidemic Disease Control and Prevention, Shenyang, Liaoning, China
| | - Baoyan An
- Veterinary Diagnostic Laboratory, Kansas State University, Manhattan, Kansas
| | - Tiruvoor G. Nagaraja
- Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, Kansas
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Paddock Z, Shi X, Bai J, Nagaraja T. Applicability of a multiplex PCR to detect O26, O45, O103, O111, O121, O145, and O157 serogroups of Escherichia coli in cattle feces1. Vet Microbiol 2012; 156:381-8. [DOI: 10.1016/j.vetmic.2011.11.017] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2011] [Revised: 11/18/2011] [Accepted: 11/22/2011] [Indexed: 10/14/2022]
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20
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Hofer E, Stephan R, Reist M, Zweifel C. Application of a real-time PCR-based system for monitoring of O26, O103, O111, O145 and O157 Shiga toxin-producing Escherichia coli in cattle at slaughter. Zoonoses Public Health 2012; 59:408-15. [PMID: 22348425 DOI: 10.1111/j.1863-2378.2012.01468.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Faecal samples were collected from 573 slaughtered cattle aged between three and 24 months in seven abattoirs. After enrichment (mTSB with novobiocin), samples were screened by real-time PCR first for stx and if positive, tested for the top-five Shiga toxin-producing Escherichia coli (STEC) serogroups using PCR assays targeting genes specific for serogroups O26, O103, O111, O145 and O157. Of 563 samples with available results, 74.1% tested positive for stx genes. Amongst them, the serogroups O145, O103, O26, O157 and O111 were detected in 41.9%, 25.9%, 23.9%, 7.8% and 0.8%, respectively. From 95 O26, 166 O145 and 30 O157 PCR-positive samples, 17 O26, 28 O145 and 12 O157 strains were isolated by colony hybridization after immunomagnetic separation. The 17 O26 strains were eae-positive, but only nine strains harboured stx (eight possessing stx1 and one stx2). Of the 28 O145 strains, ten were eae-positive including four harbouring stx1 or stx2, whereas 18 were negative for stx and eae. Five of the 12 O157 strains harboured stx2 and eae, did not ferment sorbitol, and were identified as STEC O157:H7/H⁻. The other seven O157 strains were negative for stx and eae or positive only for eae. Shiga toxin genes and the top-five STEC serogroups were frequently found in young Swiss cattle at slaughter, but success rates for strain isolation were low and only few strains showed a virulence pattern of human pathogenic STEC.
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Affiliation(s)
- E Hofer
- Institute for Food Safety and Hygiene, Vetsuisse Faculty University of Zurich, Zurich, Switzerland
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21
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Evans J, Knight H, McKendrick IJ, Stevenson H, Varo Barbudo A, Gunn GJ, Low JC. Prevalence of Escherichia coli O157 : H7 and serogroups O26, O103, O111 and O145 in sheep presented for slaughter in Scotland. J Med Microbiol 2011; 60:653-660. [PMID: 21233295 DOI: 10.1099/jmm.0.028415-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- Judith Evans
- Animal Health Group, Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG, UK
| | - Hazel Knight
- SAC Consulting, Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG, UK
| | - Iain J McKendrick
- Biomathematics & Statistics Scotland, The King's Buildings, Edinburgh EH9 3JZ, UK
| | - Heather Stevenson
- SAC Consulting, Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG, UK
| | - Antonio Varo Barbudo
- Animal Health Group, Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG, UK
| | - George J Gunn
- Animal Health Group, Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG, UK
| | - J Christopher Low
- Animal Health Group, Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG, UK
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Blais BW, Martinez-Perez A. A simple PCR-based macroarray system for detection of multiple gene markers in the identification of priority enterohemorrhagic Escherichia coli. J Food Prot 2011; 74:365-72. [PMID: 21375871 DOI: 10.4315/0362-028x.jfp-10-450] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Enterohemorrhagic Escherichia coli (EHEC) strains bearing the O antigenic determinants O157, O26, O111, O103, and O145 have a high rate of association with foodborne illness worldwide. To expand Canadian food inspection capability, a cloth-based hybridization array system (CHAS) was developed for the identification and characterization of priority EHEC. This method targets key virulence genes (eae, hlyA, vt1, and vt2) plus the rfbE gene specifying the O157 antigenic determinant, and the wzx genes specifying the O26, O111, O103, and O145 determinants. Multiplex PCR products incorporating a digoxigenin label were detected by hybridization with an array of specific oligonucleotide probes immobilized on a polyester cloth support, with subsequent immunoenzymatic assay of the captured amplicons. This method identified the relevant markers in 85 different strains bearing various combinations of the target genes (virulence and priority O-antigen markers). None of the target genes was detected in 26 different strains of other E. coli and non-E. coli bacteria. The CHAS demonstrated 100% inclusivity and 100% exclusivity characteristics, with respect to detection of the various markers among different bacterial strains. The CHAS demonstrated 100% inclusivity and 100% exclusivity characteristics, with respect to detection of the markers among various target and nontarget bacteria. The entire procedure could be completed in less than 5 h, and is useful for the identification of priority EHEC colonies isolated from foods by using enrichment culture techniques.
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Affiliation(s)
- Burton W Blais
- Ottawa Laboratory-Carling, Canadian Food Inspection Agency, Central Experimental Farm, 960 Carling Avenue, Ottawa, Canada.
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23
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Barlow RS, Mellor GE. Prevalence of EnterohemorrhagicEscherichia coliSerotypes in Australian Beef Cattle. Foodborne Pathog Dis 2010; 7:1239-45. [DOI: 10.1089/fpd.2010.0574] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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24
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Verstraete K, De Zutter L, Messens W, Herman L, Heyndrickx M, De Reu K. Effect of the enrichment time and immunomagnetic separation on the detection of Shiga toxin-producing Escherichia coli O26, O103, O111, O145 and sorbitol positive O157 from artificially inoculated cattle faeces. Vet Microbiol 2010; 145:106-12. [DOI: 10.1016/j.vetmic.2010.03.004] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2009] [Revised: 03/03/2010] [Accepted: 03/08/2010] [Indexed: 11/25/2022]
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25
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Karmali MA, Gannon V, Sargeant JM. Verocytotoxin-producing Escherichia coli (VTEC). Vet Microbiol 2010; 140:360-70. [DOI: 10.1016/j.vetmic.2009.04.011] [Citation(s) in RCA: 352] [Impact Index Per Article: 25.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2009] [Revised: 03/27/2009] [Accepted: 04/03/2009] [Indexed: 01/10/2023]
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26
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Fratamico PM, DebRoy C, Miyamoto T, Liu Y. PCR Detection of Enterohemorrhagic Escherichia coli O145 in Food by Targeting Genes in the E. coli O145 O-Antigen Gene Cluster and the Shiga Toxin 1 and Shiga Toxin 2 Genes. Foodborne Pathog Dis 2009; 6:605-11. [DOI: 10.1089/fpd.2008.0254] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Pina M. Fratamico
- Microbial Food Safety Research Unit, Eastern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, Wyndmoor, Pennsylvania
| | - Chitrita DebRoy
- Department of Veterinary and Biomedical Sciences, E. coli Reference Center, The Pennsylvania State University, University Park, Pennsylvania
| | - Takahisa Miyamoto
- Laboratory of Food Hygienic Chemistry, Kyushu University, Hakozaki, Japan
| | - Yanhong Liu
- Microbial Food Safety Research Unit, Eastern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, Wyndmoor, Pennsylvania
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27
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Evans J, Knight H, Smith A, Pearce M, Hall M, Foster G, Low J, Gunn G. Cefixime-tellurite rhamnose MacConkey agar for isolation of Vero cytotoxin-producingEscherichia coliserogroup O26 from Scottish cattle and sheep faeces. Lett Appl Microbiol 2008; 47:148-52. [DOI: 10.1111/j.1472-765x.2008.02402.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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28
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Piyasena ME, Real LJ, Diamond RA, Xu HH, Gomez FA. Magnetic microsphere-based methods to study the interaction of teicoplanin with peptides and bacteria. Anal Bioanal Chem 2008; 392:877-86. [PMID: 18712518 DOI: 10.1007/s00216-008-2327-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2008] [Revised: 07/24/2008] [Accepted: 07/29/2008] [Indexed: 11/25/2022]
Abstract
Teicoplanin (teic) from Actinoplanes teichomyceticus is a glycopeptide antibiotic used to treat many gram-positive bacterial infections. Glycopeptide antibiotics inhibit bacterial growth by binding to carboxy-terminal D-Ala-D-Ala intermediates in the peptidoglycan of the cell wall of gram-positive bacteria. In this paper we report the derivatization of magnetic microspheres with teic (teic-microspheres). Fluorescence-based techniques have been developed to analyze the binding properties of the microspheres to two D-Ala-D-Ala terminus peptides. The dissociation constant for the binding of carboxyfluorescein-labeled D-Ala-D-Ala-D-Ala to teic on microspheres was established via fluorimetry and flow cytometry and was determined to be 0.5 x 10(-6) and 3.0 x 10(-6) mol L(-1), respectively. The feasibility of utilizing microparticles with fluorescence methods to detect low levels (the limit of bacterial detection was determined to be 30 colon-forming units; cfu) of gram-positive bacteria has been demonstrated. A simple microfluidic experiment is reported to demonstrate the possibility of developing microsphere-based affinity assays to study peptide-antibiotic interaction.
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Affiliation(s)
- Menake E Piyasena
- Department of Chemistry and Biochemistry, California State University, Los Angeles, 5151 State University Drive, Los Angeles, CA 90032-8202, USA
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29
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Jenkins C, Evans J, Chart H, Willshaw GA, Frankel G. Escherichia coli serogroup O26--a new look at an old adversary. J Appl Microbiol 2008; 104:14-25. [PMID: 18171379 DOI: 10.1111/j.1365-2672.2007.03465.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Escherichia coli serogroup O26 played an important part in the early work on Verocytotoxin and is an established diarrhoeal pathogen. Recently, Verocytotoxigenic E. coli (VTEC) O26 has been increasingly associated with diarrhoeal disease and frequently linked to outbreaks and cases of haemolytic uraemic syndrome (HUS). This review investigates the pathogenicity, geographical distribution, changing epidemiology, routes of transmission and improved detection of VTEC O26. Laboratory data on VTEC O26 isolates and clinical data on HUS suggest a true difference in the incidence of VTEC O26 in different geographic locations. However, few diagnostic laboratories use molecular methods to detect VTEC and so it is difficult to assess the role of VTEC O26 in causing diarrhoeal disease. VTEC O26 is frequently found in the cattle population but rarely in food. However, the small number of outbreaks analysed to date are thought to be food-borne rather than associated with direct or indirect contact with livestock or their faeces. The increase in awareness of VTEC O26 in the clinical and veterinary setting has coincided with the development of novel techniques that have improved our ability to detect and characterize this pathogen.
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Affiliation(s)
- C Jenkins
- Department of Medical Microbiology, Royal Free Hospital, NW3 2QG, London, UK.
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30
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Jackowski M, Szeliga J, Kłodzińska E, Buszewski B. Application of capillary zone electrophoresis (CZE) to the determination of pathogenic bacteria for medical diagnosis. Anal Bioanal Chem 2008; 391:2153-60. [DOI: 10.1007/s00216-008-2021-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2007] [Revised: 02/20/2008] [Accepted: 02/22/2008] [Indexed: 11/29/2022]
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31
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Auvray F, Lecureuil C, Taché J, Leclerc V, Deperrois V, Lombard B. Detection, isolation and characterization of Shiga toxin-producing Escherichia coli in retail-minced beef using PCR-based techniques, immunoassays and colony hybridization. Lett Appl Microbiol 2007; 45:646-51. [DOI: 10.1111/j.1472-765x.2007.02239.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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32
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Dambrosio A, Lorusso V, Quaglia NC, Parisi A, La Salandra G, Virgilio S, Mula G, Lucifora G, Celano GV, Normanno G. Escherichia coli O26 in minced beef: prevalence, characterization and antimicrobial resistance pattern. Int J Food Microbiol 2007; 118:218-22. [PMID: 17727994 DOI: 10.1016/j.ijfoodmicro.2007.07.041] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2007] [Revised: 05/02/2007] [Accepted: 07/22/2007] [Indexed: 11/16/2022]
Abstract
Verocytotoxin-producing Escherichia coli (VTEC) non-O157 serogroups are among the most important emerging food-borne pathogen groups. In particular, the O26 serogroup is able to cause a large spectrum of illnesses in humans which have a significant public health impact as they may range from haemorrhagic colitis (HC) to haemolytic uremic syndrome (HUS) and thrombotic thrombocytopenic purpura (TTP). It is known that VTEC organisms are associated with animal reservoirs, i.e. ruminants, and foods of animal origin, especially undercooked meat and raw milk, are often involved in outbreaks. In this study, 250 minced beef samples collected at retail outlets in southern Italy were tested for the presence of E. coli O26 and the isolates were characterized and studied for their antimicrobial resistance properties. Three minced beef samples (1.2%) tested positive for E. coli O26; one isolate per positive sample was characterized. One isolate harboured the genes encoding for virulence factors intimin (eaeA) and enterohaemolysin (hlyA), while none presented verocytotoxin-encoding genes (stx1 and stx2) and all were negative at the verotoxicity assay. All the isolates showed resistance properties to at least four antimicrobial agents tested and two were multi-drug resistant (MDR). Although no verocytotoxin-encoding genes were found in the isolates, the presence of potentially pathogenic E. coli O26 strains in minced beef points to the need for proper hygiene during meat production to reduce the risk of food-borne illnesses and transmission of MDR organisms via foods to humans. This paper is the first report on the presence and characterization of E. coli O26 in minced beef marketed in Italy.
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Affiliation(s)
- A Dambrosio
- Department of Health and Animal Welfare-Faculty of Veterinary Medicine-Str. Prov. per Casamassima Km 3, 70010 Valenzano (Ba), Italy
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Bonardi S, Foni E, Chiapponi C, Salsi A, Brindani F. Detection of verocytotoxin-producing Escherichia coli serogroups 0157 and 026 in the cecal content and lymphatic tissue of cattle at slaughter in Italy. J Food Prot 2007; 70:1493-7. [PMID: 17612082 DOI: 10.4315/0362-028x-70.6.1493] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Verocytotoxin-producing Escherichia coli (VTEC) has emerged as a foodborne pathogen that can cause severe and potentially fatal illnesses, such as hemorrhagic colitis or the hemolytic uremic syndrome. In this study, 182 cattle at slaughter (119 dairy cows and 63 feedlot cattle) were randomly selected and tested for the presence of VTEC serogroups O26, O103, O111, O145, and O157 in their cecal content and lymphatic tissue (tonsils or mesenteric lymph nodes). A total of 364 samples were evaluated with an immunomagnetic separation technique followed by slide agglutination. Presumptive VTEC 026, O103, O111, O145, and O157 isolates were tested by Vero cell assay for verocytotoxin production and by multiplex PCR assay for the detection of vtxl, vtx2, eae, and E-hlyA genes. VTEC O157 was detected in 6 (3.3%) of 182 animals, and VTEC 026 was detected in 1 (0.5%) of 182 animals. No VTEC O103, VTEC O111, or VTEC O145 isolates were found in cattle feces, but one VTEC O91:H- vtx2+, eae-, E-hlyA+ strain nonspecifically cross-reacted with the VTEC O103 type. The prevalence of VTEC O157 in the lymphatic tissue of cattle was 1.1% in both tonsils (1 of 93 samples) and mesenteric lymph nodes (1 of 89 samples). Lymphatic tissue contamination was observed only in VTEC O157 intestinal carriers; two (33.3%) of six fecal carriers were simultaneously VTEC O157 lymphatic carriers. This finding suggests that VTEC O157 contamination of meat does not necessarily come from feces or the environment. No other VTEC serogroups were detected in the lymphatic tissue of slaughtered cattle.
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Affiliation(s)
- Silvia Bonardi
- Animal Health Department, Section of Food Inspection, Faculty of Veterinary Medicine, University of Parma, Via del Taglio 8, 43100 Parma, Italy.
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Ogura Y, Ooka T, Whale A, Garmendia J, Beutin L, Tennant S, Krause G, Morabito S, Chinen I, Tobe T, Abe H, Tozzoli R, Caprioli A, Rivas M, Robins-Browne R, Hayashi T, Frankel G. TccP2 of O157:H7 and non-O157 enterohemorrhagic Escherichia coli (EHEC): challenging the dogma of EHEC-induced actin polymerization. Infect Immun 2006; 75:604-12. [PMID: 17101643 PMCID: PMC1828498 DOI: 10.1128/iai.01491-06] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Enterohemorrhagic Escherichia coli (EHEC) O157:H7 and enteropathogenic E. coli (EPEC) trigger actin polymerization at the site of bacterial adhesion by inducing different signaling pathways. Actin assembly by EPEC requires tyrosine phosphorylation of Tir, which subsequently binds the host adaptor protein Nck. In contrast, Tir(EHEC O157) is not tyrosine phosphorylated and instead of Nck utilizes the bacterially encoded Tir-cytoskeleton coupling protein (TccP)/EspF(U), which mimics the function of Nck. tccP is carried on prophage CP-933U/Sp14 (TccP). Typical isolates of EHEC O157:H7 harbor a pseudo-tccP gene that is carried on prophage CP-933 M/Sp4 (tccP2). Here we report that atypical, beta-glucuronidase-positive and sorbitol-fermenting, strains of EHEC O157 harbor intact tccP and tccP2 genes, both of which are secreted by the LEE-encoded type III secretion system. Non-O157 EHEC strains, including O26, O103, O111, and O145, are typically tccP negative and translocate a Tir protein that encompasses an Nck binding site. Unexpectedly, we found that most clinical non-O157 EHEC isolates carry a functional tccP2 gene that encodes a secreted protein that can complement an EHEC O157:H7 DeltatccP mutant. Using discriminatory, allele-specific PCR, we have demonstrated that over 90% of tccP2-positive non-O157 EHEC strains contain a Tir protein that can be tyrosine phosphorylated. These results suggest that the TccP pathway can be used by both O157 and non-O157 EHEC and that non-O157 EHEC can also trigger actin polymerization via the Nck pathway.
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Affiliation(s)
- Yoshitoshi Ogura
- Division of Cell and Molecular Biology, Flowers Building, Imperial College London, London SW7 2AZ, United Kingdom
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Abstract
The objective of this review is to highlight the importance of cattle in human disease due to Shiga toxin-producing Escherichia coli (STEC) and to discuss features of STEC that are important in human disease. Healthy dairy and beef cattle are a major reservoir of a diverse group of STEC that infects humans through contamination of food and water, as well as through direct contact. Infection of humans by STEC may result in combinations of watery diarrhea, bloody diarrhea, and hemolytic uremic syndrome. Systems of serotyping, subtyping, and virulence typing of STEC are used to aid in epidemiology, diagnosis, and pathogenesis studies. Severe disease and outbreaks of disease are most commonly due to serotype O157:H7, which, like most other highly pathogenic STEC, colonize the large intestine by means of a characteristic attaching and effacing lesion. This lesion is induced by a bacterial type III secretion system that injects effector proteins into the intestinal epithelial cell, resulting in profound changes in the architecture and metabolism of the host cell and intimate adherence of the bacteria. Severe disease in the form of bloody diarrhea and the hemolytic uremic syndrome is attributable to Shiga toxin (Stx), which exists as 2 major types, Stx1 and Stx2. The stx genes are encoded on temperate bacteriophages in the chromosome of the bacteria, and production and release of the toxin are highly dependent on induction of the phages. Regulation of the genes involved in induction of the attaching and effacing lesion, and production of Stx is complex. In addition to these genes that are clearly implicated in virulence, there are several putative virulence factors. A major public health goal is to prevent STEC-induced disease in humans. Studies aimed at understanding factors that affect carriage and shedding of STEC by cattle and factors that contribute to development of disease in humans are considered to be important in achieving this objective.
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Affiliation(s)
- C L Gyles
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada, N1G 2W1.
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Hall LM, Evans J, Smith AW, Pearce MC, Knight HI, Foster G, Low JC, Gunn GJ. Sensitivity of an immunomagnetic-separation-based test for detecting Escherichia coli O26 in bovine feces. Appl Environ Microbiol 2006; 72:7260-3. [PMID: 16980429 PMCID: PMC1636212 DOI: 10.1128/aem.03028-05] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The sensitivity of a test for cattle shedding Escherichia coli serogroup O26 was estimated using several fecal pats artificially inoculated at a range of concentrations with different E. coli O26 strains. The test involves the enrichment of fecal microflora in buffered peptone water, the selective concentration of E. coli O26 using antibody-coated immunomagnetic-separation beads, the identification of E. coli colonies on Chromocult tryptone bile X-glucuronide agar, and confirmation of the serogroup with E. coli serogroup O26-specific antisera using slide agglutination. The effective dose of E. coli O26 for an 80% test sensitivity (ED(80)) was 1.0 x 10(4) CFU g(-1) feces (95% confidence interval, 4.7 x 10(3) to 2.4 x 10(4)). Differences in test sensitivity between different E. coli O26 strains and fecal pats were also observed. Individual estimates of ED(80) for each strain and fecal pat combination ranged from 4.2 x 10(2) to 4.8 x 10(5) CFU g(-1). These results suggest that the test is useful for identifying individuals shedding a large number of E. coli O26 organisms or, if an appropriate number of individuals in a herd are sampled, for identifying affected herds. The study also provides a benchmark estimate of sensitivity that can be used to compare alternative tests for E. coli O26 and a methodological approach that can be applied to tests for other pathogenic members of the Enterobacteriaceae and other sample types.
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Affiliation(s)
- L M Hall
- Scottish Agricultural College, Stratherrick Rd., Inverness IV2 4JZ, United Kingdom.
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37
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Blais BW, Bosley J, Martinez-Perez A, Popela M. Polymyxin-based enzyme-linked immunosorbent assay for the detection of Escherichia coli O111 and O26. J Microbiol Methods 2006; 65:468-75. [PMID: 16202462 DOI: 10.1016/j.mimet.2005.09.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2005] [Revised: 09/02/2005] [Accepted: 09/08/2005] [Indexed: 11/24/2022]
Abstract
Polymyxin-based enzyme-linked immunosorbent assay (polymyxin-ELISA) systems were developed for the detection of Escherichia coli O111 and O26 in ground beef after enrichment. Polymyxin immobilized in the wells of a microtiter plate served as a high affinity adsorbent for lipopolysaccharide (LPS) antigens, which were detected immunoenzymatically using commercially available anti-E. coli O111 or anti-E. coli O26 antisera. The polymyxin-ELISA sensitively detected E. coli strains bearing the O111 and O26 LPS antigens, discriminating between these target strains and a panel of various non-target Gram negative and Gram positive bacteria. The detection of E. coli O111 and O26 strains inoculated into ground beef was achieved after enrichment in either modified trypticase soy broth (TSB) with novobiocin, or the serotype-specific medium TSB supplemented with cefixime and vancomycin (E. coli O111), and the same medium containing potassium tellurite (E. coli O26). The polymyxin-ELISA shows promise as a rapid, simple and inexpensive screening tool for E. coli O111 and O26 in enrichment cultures of ground beef.
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Affiliation(s)
- Burton W Blais
- Ottawa Laboratory (Carling), Canadian Food Inspection Agency, Central Experimental Farm.
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Pearce MC, Evans J, McKendrick IJ, Smith AW, Knight HI, Mellor DJ, Woolhouse MEJ, Gunn GJ, Low JC. Prevalence and virulence factors of Escherichia coli serogroups O26, O103, O111, and O145 shed by cattle in Scotland. Appl Environ Microbiol 2006; 72:653-9. [PMID: 16391103 PMCID: PMC1352218 DOI: 10.1128/aem.72.1.653-659.2006] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2005] [Accepted: 11/02/2005] [Indexed: 01/01/2023] Open
Abstract
A national survey was conducted to determine the prevalence of Escherichia coli O26, O103, O111, and O145 in feces of Scottish cattle. In total, 6,086 fecal pats from 338 farms were tested. The weighted mean percentages of farms on which shedding was detected were 23% for E. coli O26, 22% for E. coli O103, and 10% for E. coli O145. The weighted mean prevalences in fecal pats were 4.6% for E. coli O26, 2.7% for E. coli O103, and 0.7% for E. coli O145. No E. coli O111 was detected. Farms with cattle shedding E. coli serogroup O26, O103, or O145 were widely dispersed across Scotland and were identified most often in summer and autumn. However, on individual farms, fecal shedding of E. coli O26, O103, or O145 was frequently undetectable or the numbers of pats testing positive were small. For serogroup O26 or O103 there was clustering of positive pats within management groups, and the presence of an animal shedding one of these serogroups was a positive predictor for shedding by others, suggesting local transmission of infection. Carriage of vtx was rare in E. coli O103 and O145 isolates, but 49.0% of E. coli O26 isolates possessed vtx, invariably vtx1 alone or vtx1 and vtx2 together. The carriage of eae and ehxA genes was highly associated in all three serogroups. Among E. coli serogroup O26 isolates, 28.9% carried vtx, eae, and ehxA-a profile consistent with E. coli O26 strains known to cause human disease.
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Affiliation(s)
- M C Pearce
- Centre for Tropical Veterinary Medicine, University of Edinburgh, Roslin, Midlothian EH25 9RG, United Kingdom
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Fratamico PM, DebRoy C, Strobaugh TP, Chen CY. DNA sequence of the Escherichia coli O103 O antigen gene cluster and detection of enterohemorrhagic E. coli O103 by PCR amplification of the wzx and wzy genes. Can J Microbiol 2005; 51:515-22. [PMID: 16121232 DOI: 10.1139/w05-049] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Escherichia coli serogroup O103 has been associated with gastrointestinal illness and hemolytic uremic syndrome. To develop PCR-based methods for detection and identification of this serogroup, the DNA sequence of the 12,033-bp region containing the O antigen gene cluster of Escherichia coli O103 was determined. Of the 12 open reading frames identified, the E. coli O103 wzx (O antigen flippase) and wzy (O antigen polymerase) genes were selected as targets for development of both conventional and real-time PCR assays specific for this serogroup. In addition, a multiplex PCR targeting the Shiga toxin (Stx) 1 (stx1), Shiga toxin 2 (stx2), wzx, and wzy genes was developed to differentiate Stx-producing E. coli O103 from non-toxigenic strains. The PCR assays can be employed to identify E. coli serogroup O103, replacing antigen-based serotyping, and to potentially detect the organism in food, fecal, or environmental samples.
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Affiliation(s)
- Pina M Fratamico
- Eastern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, Wyndmoor, PA 19038, USA.
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O’Hanlon KA, Catarame TM, Blair IS, McDowell DA, Duffy G. Comparison of a real-time PCR and an IMS/culture method to detect Escherichia coli O26 and O111 in minced beef in the Republic of Ireland. Food Microbiol 2005. [DOI: 10.1016/j.fm.2004.11.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Abstract
Enterohaemorrhagic Escherichia coli (EHEC) are the pathogenic subgroup of Shiga toxin (Stx)-producing E. coli. EHEC can cause non-bloody and bloody diarrhoea, and the haemolytic uraemic syndrome (HUS). HUS is a major cause of acute renal failure in children. E. coli O57:H7 is the predominant, but far from being the only, serotype that can cause HUS. The cascade leading from gastrointestinal infection to renal impairment is complex, with the microvascular endothelium being the major histopathological target. EHEC also produce non-Stx molecules, such as cytolethal distending toxin, which can contribute to the endothelial or vascular injury. Because there are no specific therapies for EHEC infections, efficient reservoir and human preventive strategies are important areas of ongoing investigations. This review will focus on the microbiology, epidemiology, and pathophysiology of EHEC-associated diseases, and illustrate future challenges and opportunities for their control.
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Affiliation(s)
- Helge Karch
- Institute for Hygiene, and National Consulting Laboratory on Haemolytic Uraemic Syndrome, University Hospital Münster, Robert Koch Str. 41, D-48149 Münster, Germany.
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Renter DG, Morris JG, Sargeant JM, Hungerford LL, Berezowski J, Ngo T, Williams K, Acheson DWK. Prevalence, risk factors, O serogroups, and virulence profiles of Shiga toxin-producing bacteria from cattle production environments. J Food Prot 2005; 68:1556-65. [PMID: 21132960 DOI: 10.4315/0362-028x-68.8.1556] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Shiga toxin (Stx)-producing bacteria are important human pathogens that have been linked with cattle and associated food products. We recovered Stx-producing bacteria from 27.5% of cattle, 6.8% of water, and 2.3% of wildlife samples from a cattle production area during an 11-month period. Positive samples were found during every month and on 98% of sampling days. We recovered isolates from all cattle operations sampled, and prevalence within operations ranged from approximately 5 to 33%. Cattle prevalence was associated with the presence of Stx-producing bacteria in water and the production group and environment of cattle, with an interaction between production group and environment. Odds of recovering isolates from cattle were highest for groups of adult cows and their unweaned calves in pasture environments. Overall, 49 O serogroups were identified from 527 isolates. Seventy of the isolates contained virulence genes that encoded intimin and enterohemorrhagic Escherichia coli hemolysin. These were serogroups O111, O157, O109, O103, O145, O172, O84, O26, O108, O117, O126, O159, O5, O69, O74, O98, and O-rough. Our results suggest that the prevalence of Stx-producing bacteria can be relatively high in cattle, and associated factors may not be entirely similar to those reported for serotype O157:H7. Although Stx-producing bacteria were frequently detected, the strains may not be equally pathogenic for humans given the wide variety of serogroups and virulence genes. However, focusing on O157:H7 in food safety and surveillance programs may allow other Stx-producing bacteria, which appear to be widespread in cattle, to go undetected.
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Affiliation(s)
- David G Renter
- Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas 66506, USA.
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Duan HL, Shen ZQ, Wang XW, Chao FH, Li JW. Preparation of immunomagnetic iron-dextran nanoparticles and application in rapid isolation of E.coli O157:H7 from foods. World J Gastroenterol 2005; 11:3660-4. [PMID: 15968716 PMCID: PMC4316012 DOI: 10.3748/wjg.v11.i24.3660] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To prepare a kind of magnetic iron-dextran nanoparticles that was coated with anti-E.coli O157:H7 IgG, analyze its application conditions, and try to use it to isolate E.coli O157:H7 from foods.
METHODS: Magnetic iron-dextran nanoparticles were prepared by the reaction of a mixture of ferric and ferrous ions with dextran polymers under alkaline conditions. The particles were coated with antiserum against E.coli O157:H7 by the periodate oxidation-borohydride reduction procedure. The oxidation time, amount of antibody coating the particles, amount of nanoparticles, incubation time and isolation time were varied to determine their effects on recovery of the organisms. Finally, the optimum conditions for isolating E.coli O157:H7 from food samples were established.
RESULTS: E.coli O157:H7 can be isolated from samples within 15 min with the sensitivity of 101 CFU/mL or even less. In the presence of 108 CFU/mL of other organisms, the sensitivity is 101-102 CFU/mL. Nonspecific binding of other bacteria to the particles was not observed. Two and a half hours of enrichment is enough for the particles to detect the target from the food samples inoculated with 1 CFU/g.
CONCLUSION: Isolation of target bacteria by immuno-magnetic nanoparticles is an efficient method with high sensitivity and specificity. The technique is so simple that it can be operated in lab and field even by untrained personnel.
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Affiliation(s)
- Hui-Li Duan
- Department of Environmental Health, Institute of Hygiene and Environmental Medicine, Tianjin 300050, China
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Shaw DJ, Jenkins C, Pearce MC, Cheasty T, Gunn GJ, Dougan G, Smith HR, Woolhouse MEJ, Frankel G. Shedding patterns of verocytotoxin-producing Escherichia coli strains in a cohort of calves and their dams on a Scottish beef farm. Appl Environ Microbiol 2005; 70:7456-65. [PMID: 15574948 PMCID: PMC535143 DOI: 10.1128/aem.70.12.7456-7465.2004] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Rectal fecal samples were taken once a week from 49 calves on the same farm. In addition, the dams of the calves were sampled at the time of calf birth and at the end of the study. Strains of verocytotoxin-producing Escherichia coli (VTEC) were isolated from these samples by using PCR and DNA probe hybridization tests and were characterized with respect to serotype, verocytotoxin gene (vtx) type, and the presence of the intimin (eae) and hemolysin (ehxA) genes. A total of 170 VTEC strains were isolated during 21 weeks from 130 (20%) of 664 samples from calves and from 40 (47%) of 86 samples from their dams. The characteristics of the calf strains differed from those strains isolated from the dams with respect to verocytotoxin 2 and the presence of the eae gene. In addition, no calf shed the same VTEC serogroup (excluding O?) as its dam at birth or at the end of the study. The most frequently detected serogroups in calves were serogroup O26 and provisional serogroup E40874 (VTEC O26 was found in 25 calves), whereas in dams serogroup O91 and provisional serogroup E54071 were the most common serogroups. VTEC O26 shedding appeared to be associated with very young calves and declined as the calves aged, whereas VTEC O2 shedding was associated with housing of the animals. VTEC O26 strains from calves were characterized by the presence of the vtx1, eae, and ehxA genes, whereas vtx2 was associated with VTEC O2 and provisional serogroup E40874. The high prevalence of VTEC O26 and of VTEC strains harboring the eae gene in this calf cohort is notable because of the association of the O26 serogroup and the presence of the eae gene with human disease. No association between calf diarrhea and any of the VTEC serogroups was identified.
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Affiliation(s)
- D J Shaw
- Veterinary Epidemiology Group, Centre for Tropical and Veterinary Medicine, College of Medicine and Veterinary Medicine, University of Edinburgh, Roslin, Midlothian, United Kingdom.
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Irino K, Kato MAMF, Vaz TMI, Ramos II, Souza MAC, Cruz AS, Gomes TAT, Vieira MAM, Guth BEC. Serotypes and virulence markers of Shiga toxin-producing Escherichia coli (STEC) isolated from dairy cattle in São Paulo State, Brazil. Vet Microbiol 2005; 105:29-36. [PMID: 15607081 DOI: 10.1016/j.vetmic.2004.08.007] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2004] [Revised: 08/17/2004] [Accepted: 08/24/2004] [Indexed: 11/22/2022]
Abstract
In order to determine the occurrence, serotypes and virulence markers of Shiga toxin-producing Escherichia coli (STEC) strains, 153 fecal samples of cattle randomly selected from six dairy farms in Sao Paulo State, Brazil, were examined for Shiga toxin (Stx) production by the Vero cell assay. Feces were directly streaked onto MacConkey Sorbitol Agar and incubated at 37 degrees C overnight. Sorbitol-negative colonies (maximum 20) and up to 10 sorbitol-positive colonies from each plate were subcultured onto presumptive diagnostic medium IAL. Sorbitol-negative isolates were screened with O157 antiserum for identification of O157:H7 E. coli. Isolates presenting cytotoxic activity were submitted to colony hybridization assays with specific DNA probes for stx1, stx2, eae, Ehly and astA genes. The isolation rate of STEC ranged from 3.8 to 84.6% depending on the farm analysed. STEC was identified in 25.5% of the animals, and most of them (64.1%) carried a single STEC serotype. A total of 202 STEC isolates were recovered from the animals, and except for the 2 O157:H7 isolates all the others expressed cytotoxic activity. The great majority of the STEC isolates carried both stx1 and stx2 genes (114/202, 56.4%) or stx2 (82/202, 40.6%); and whereas the Ehly sequence occurred in most of them (88%) eae was only observed in O157:H7 and O111:HNM isolates. Serotypes O113:H21, O178:H19 and O79:H14 were the most frequent STEC serotypes identified and widely distributed among animals from different farms, while others such as O77:H18, O88:H25 and O98:H17 occurred only in particular farms. This is the first report on the occurrence of STEC in dairy cattle in Sao Paulo State, and the results point to substantial differences in rate of isolation, serotypes and genetic profile of STEC that has been previously described among beef cattle in our community. Moreover, to our knowledge O79:H14 and O98:H17 represent new STEC serotypes, while O178:H19 has only been recently reported in Spain.
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Affiliation(s)
- K Irino
- Instituto Adolfo Lutz, Av. Dr. Arnaldo, 351 Cerqueira César, CEP 01246-902, São Paulo, Brazil.
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