scholarly journals Haemolytic–uraemic syndrome caused by a non-O157 : H7 Escherichia coli strain in experimentally inoculated dogs

2006 ◽  
Vol 55 (1) ◽  
pp. 23-29 ◽  
Author(s):  
Jian-Yang Wang ◽  
Shi-Shan Wang ◽  
Pin-Zhang Yin
Keyword(s):  
Escherichia Coli ◽  
Renal Failure ◽  
Acute Renal Failure ◽  
Haemolytic Uraemic Syndrome ◽  
Clinical Signs ◽  
Multiple Organ ◽  
Coli Strain ◽  
Watery Diarrhoea ◽  
Domestic Sheep ◽  
E Coli

Both O157 : H7 and non-O157 : H7 Escherichia coli strains are reported to cause haemolytic–uraemic syndrome (HUS). This study was carried out to explore the pathogenicity of O157 : H7 and non-O157 : H7 E. coli strains in experimentally inoculated dogs. Twenty 40-day-old dogs were randomly divided into four groups, and the groups (n=5) were administrated orally with E. coli O157 : H7 strains HJ2001-1 (from a patient with serious haemorrhagic diarrhoea) and HZ2001-4 (from a domestic sheep kept in the house of a patient who died from diarrhoea and subsequent acute renal failure), HZ2001-9 (a non-O157 : H7 strain, from a 6-month-old child who died from diarrhoea and subsequent acute renal failure) or a control strain, EC8099. HJ2001-1 and HZ2001-4 caused slight diarrhoea, and the dogs recovered without any complications. However, HZ2001-9 resulted in watery diarrhoea accompanied with slightly bloody stools, followed by death on the fifth or sixth day. In the fatally infected experimental animals, necrotic lesions in the liver and bacterial embolism in the kidney were observed. The primary cause of death was microvascular thrombosis caused by the bacteria, leading to renal and multiple organ failure. Therefore, the non-O157 : H7 E. coli strain HZ2001-9 causes clinical signs and pathological lesions in dogs that are consistent with those in acute renal failure or HUS in humans.

scholarly journals Enhanced surveillance of haemolytic uraemic syndrome and other thrombotic microangiopathies in Scotland, 2003-2004

2005 ◽  
Vol 10 (20) ◽  
Author(s):  
Kevin Pollock
Keyword(s):  
Escherichia Coli ◽  
Renal Failure ◽  
Acute Renal Failure ◽  
Haemolytic Uraemic Syndrome ◽  
Escherichia Coli O157 ◽  
Thrombotic Microangiopathies ◽  
E Coli

Previous surveillance of childhood haemolytic uraemic syndrome (HUS) in Scotland has identified Escherichia coli O157 in over 90% of cases, and infection with E. coli O157 is now reported to be one of the major causes of acute renal failure in children

scholarly journals Characteristics of the enteroaggregative Shiga toxin/verotoxin-producing Escherichia coli O104:H4 strain causing the outbreak of haemolytic uraemic syndrome in Germany, May to June 2011

2011 ◽  
Vol 16 (24) ◽  
Author(s):  
F Scheutz ◽  
E Møller Nielsen ◽  
J Frimodt-Møller ◽  
N Boisen ◽  
S Morabito ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Shiga Toxin ◽  
Haemolytic Uraemic Syndrome ◽  
Coli Strain ◽  
Screening Tools ◽  
International Exchange ◽  
Outbreak Strain ◽  
Diagnostic Screening ◽  
E Coli ◽  
Large Outbreak

The Escherichia coli strain causing a large outbreak of haemolytic uraemic syndrome and bloody diarrhoea in Germany in May and June 2011 possesses an unusual combination of pathogenic features typical of enteroaggregative E. coli together with the capacity to produce Shiga toxin. Through rapid national and international exchange of information and strains the known occurrence in humans was quickly assessed. We describe simple diagnostic screening tools to detect the outbreak strain in clinical specimens and a novel real-time PCR for its detection in foods.

scholarly journals A prospective study of exposure to verotoxin-producingEscherichia coliamong Canadian children with haemolytic uraemic syndrome

1993 ◽  
Vol 110 (1) ◽  
pp. 1-7 ◽  
Author(s):  
P. C. Rowe ◽  
E. Orrbine ◽  
H. Lior ◽  
G. A. Wells ◽  
P. N. McLaine
Keyword(s):  
Escherichia Coli ◽  
Renal Failure ◽  
North America ◽  
Haemolytic Uraemic Syndrome ◽  
Stool Culture ◽  
Oligonucleotide Probes ◽  
E Coli ◽  
O 157 ◽  
A Prospective Study

SUMMARYHaemolytic uraemic syndrome (HUS) is a leading cause of acute renal failure in childhood. Although infection withEscherichia coliO 157. H7 has been associated with HUS in North America and Europe, only a limited number of studies have examined the role of other verotoxin-producingE. coli(VTEC) serotypes in this condition. To address this issue, we conducted a comprehensive, prospective microbiological study of patients treated for HUS at eight Canadian hospitals in the summer of 1990. Of the 34 consecutive patients with HUS enrolled over 4 months,E. coli0 157. H7 was isolated from the stools of 26, and otherE. coliserotypes were isolated from four patients. In four subjects no pathogenicE. coliserotypes were identified on stool culture. Using oligonucleotide probes specific for VT-1 and VT-2, verotoxin genes were detected in the stool isolates of all patients withE. coliO 157.H7, and from two with otherE. coliserotypes. Two other patients had at least a fourfold rise in anti-verotoxin antibodies. Strong evidence of exposure to a verotoxin was present in 30/34 (88%). Patients withE. coli0 157.H7 infection were more likely to develop an antibody response to VT-2 than to VT-1 (22/22 vs 12/22; P = 0.002). These results further strengthen the association of HUS with verotoxin-producingE. coliin North America, and confirm thatE. coliserotypes other than 0 157. H7 are isolated in a small proportion of summertime HUS episodes.

scholarly journals Development and Validation of Shiga Toxin-Producing Escherichia coli Immunodiagnostic Assay

2019 ◽  
Vol 7 (9) ◽  
pp. 276 ◽  
Author(s):  
Miriam Silva ◽  
Anna Santos ◽  
Leticia Rocha ◽  
Bruna Caetano ◽  
Thais Mitsunari ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Renal Failure ◽  
Acute Renal Failure ◽  
Shiga Toxin ◽  
Latex Agglutination ◽  
Agglutination Test ◽  
Hemorrhagic Colitis ◽  
E Coli ◽  
Uremic Syndrome ◽  
Development And Validation

Shiga toxin (Stx)–producing Escherichia coli (STEC) and its subgroup enterohemorrhagic E. coli are important pathogens involved in diarrhea, which may be complicated by hemorrhagic colitis and hemolytic uremic syndrome, the leading cause of acute renal failure in children. Early diagnosis is essential for clinical management, as an antibiotic treatment in STEC infections is not recommended. Previously obtained antibodies against Stx1 and Stx2 toxins were employed to evaluate the sensitivity and specificity of the latex Agglutination test (LAT), lateral flow assay (LFA), and capture ELISA (cEIA) for STEC detection. The LAT (mAb Stx1 plus mAb stx2) showed 99% sensitivity and 97% specificity. Individually, Stx1 antibodies showed 95.5% and 94% sensitivity and a specificity of 97% and 99% in the cEIA and LFA assay, respectively. Stx2 antibodies showed a sensitivity of 92% in both assays and a specificity of 100% and 98% in the cEIA and LFA assay, respectively. These results allow us to conclude that we have robust tools for the diagnosis of STEC infections.

scholarly journals Regulation of Expression of the TIR-Containing Protein C Gene of the Uropathogenic Escherichia coli Strain CFT073

Pathogens ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 549
Author(s):  
Julia Ittensohn ◽  
Jacqueline Hemberger ◽  
Hannah Griffiths ◽  
Maren Keller ◽  
Simone Albrecht ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Protein C ◽  
Interleukin 1 ◽  
Coli Strain ◽  
Uropathogenic Escherichia Coli ◽  
Reporter Construct ◽  
Regulation Of Expression ◽  
E Coli ◽  
Strain Cft073 ◽  
Myeloid Differentiation Factor

The uropathogenic Escherichia coli strain CFT073 causes kidney abscesses in mice Toll/interleukin-1 receptor domain-containing protein C (TcpC) dependently and the corresponding gene is present in around 40% of E. coli isolates of pyelonephritis patients. It impairs the Toll-like receptor (TLR) signaling chain and the NACHT leucin-rich repeat PYD protein 3 inflammasome (NLRP3) by binding to TLR4 and myeloid differentiation factor 88 as well as to NLRP3 and caspase-1, respectively. Overexpression of the tcpC gene stopped replication of CFT073. Overexpression of several tcpC-truncation constructs revealed a transmembrane region, while its TIR domain induced filamentous bacteria. Based on these observations, we hypothesized that tcpC expression is presumably tightly controlled. We tested two putative promoters designated P1 and P2 located at 5′ of the gene c2397 and 5′ of the tcpC gene (c2398), respectively, which may form an operon. High pH and increasing glucose concentrations stimulated a P2 reporter construct that was considerably stronger than a P1 reporter construct, while increasing FeSO4 concentrations suppressed their activity. Human urine activated P2, demonstrating that tcpC might be induced in the urinary tract of infected patients. We conclude that P2, consisting of a 240 bp region 5′ of the tcpC gene, represents the major regulator of tcpC expression.

scholarly journals Transcriptomic Analysis of Shiga Toxin-Producing Escherichia coli during Initial Contact with Cattle Colonic Explants

2020 ◽  
Vol 8 (11) ◽  
pp. 1662
Author(s):  
Zachary R. Stromberg ◽  
Rick E. Masonbrink ◽  
Melha Mellata
Keyword(s):  
Escherichia Coli ◽  
Shiga Toxin ◽  
Bacterial Colonization ◽  
Coli Strain ◽  
Fold Change ◽  
Initial Contact ◽  
Lon Protease ◽  
E Coli ◽  
Log2 Fold Change ◽  
Colonization Factors

Foodborne pathogens are a public health threat globally. Shiga toxin-producing Escherichia coli (STEC), particularly O26, O111, and O157 STEC, are often associated with foodborne illness in humans. To create effective preharvest interventions, it is critical to understand which factors STEC strains use to colonize the gastrointestinal tract of cattle, which serves as the reservoir for these pathogens. Several colonization factors are known, but little is understood about initial STEC colonization factors. Our objective was to identify these factors via contrasting gene expression between nonpathogenic E. coli and STEC. Colonic explants were inoculated with nonpathogenic E. coli strain MG1655 or STEC strains (O26, O111, or O157), bacterial colonization levels were determined, and RNA was isolated and sequenced. STEC strains adhered to colonic explants at numerically but not significantly higher levels compared to MG1655. After incubation with colonic explants, flagellin (fliC) was upregulated (log2 fold-change = 4.0, p < 0.0001) in O157 STEC, and collectively, Lon protease (lon) was upregulated (log2 fold-change = 3.6, p = 0.0009) in STEC strains compared to MG1655. These results demonstrate that H7 flagellum and Lon protease may play roles in early colonization and could be potential targets to reduce colonization in cattle.

scholarly journals Enteroaggregative Escherichia coli: epidemiology, virulence and detection

2007 ◽  
Vol 56 (1) ◽  
pp. 4-8 ◽  
Author(s):  
Andrej Weintraub
Keyword(s):  
Escherichia Coli ◽  
Tissue Culture ◽  
Watery Diarrhoea ◽  
Biological Assays ◽  
E Coli ◽  
The Past ◽  
Sporadic Cases ◽  
Trained Staff ◽  
Definition Of ◽  
Specific Virulence

Enteroaggregative Escherichia coli (EAEC) is a subgroup of diarrhoeagenic E. coli (DEC) that during the past decade has received increasing attention as a cause of watery diarrhoea, which is often persistent. EAEC have been isolated from children and adults worldwide. As well as sporadic cases, outbreaks of EAEC-caused diarrhoea have been described. The definition of EAEC is the ability of the micro-organism to adhere to epithelial cells such as HEp-2 in a very characteristic ‘stacked-brick’ pattern. Although many studies searching for specific virulence factor(s) unique for this category of DEC have been published it is still unknown why the EAEC cause persistent diarrhoea. In addition, the aggregative property of EAEC causes a lot of problems in serotyping due to the cells auto-agglutinating. The gold standard for identification of EAEC includes isolation of the agent and an adherence assay using tissue culture, viz. HEp-2 cells. This assay is in most cases reliable; however, emergence of ‘atypical’ EAEC has been described in several publications. In addition, the HEp-2 assay is time consuming, demands a tissue culture lab and trained staff. Several molecular biological assays have been described, however, none show 100 % specificity.

scholarly journals Construction of an artificial biosynthetic pathway for hyperextended archaeal membrane lipids in the bacterium Escherichia coli

2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Ryo Yoshida ◽  
Hisashi Hemmi
Keyword(s):  
Escherichia Coli ◽  
Biosynthetic Pathway ◽  
Membrane Lipids ◽  
Extreme Environments ◽  
Halophilic Archaea ◽  
Coli Strain ◽  
Glycerol Moiety ◽  
Hyperthermophilic Archaeon ◽  
E Coli ◽  
Aeropyrum Pernix

Abstract Archaea produce unique membrane lipids, which possess two fully saturated isoprenoid chains linked to the glycerol moiety via ether bonds. The isoprenoid chain length of archaeal membrane lipids is believed to be important for some archaea to thrive in extreme environments because the hyperthermophilic archaeon Aeropyrum pernix and some halophilic archaea synthesize extended C25,C25-archaeal diether-type membrane lipids, which have isoprenoid chains that are longer than those of typical C20,C20-diether lipids. Natural archaeal diether lipids possessing longer C30 or C35 isoprenoid chains, however, have yet to be isolated. In the present study, we attempted to synthesize such hyperextended archaeal membrane lipids. We investigated the substrate preference of the enzyme sn-2,3-(digeranylfarnesyl)glycerol-1-phosphate synthase from A. pernix, which catalyzes the transfer of the second C25 isoprenoid chain to the glycerol moiety in the biosynthetic pathway of C25,C25-archaeal membrane lipids. The enzyme was shown to accept sn-3-hexaprenylglycerol-1-phosphate, which has a C30 isoprenoid chain, as a prenyl acceptor substrate to synthesize sn-2-geranylfarnesyl-3-hexaprenylglycerol-1-phosphate, a supposed precursor for hyperextended C25,C30-archaeal membrane lipids. Furthermore, we constructed an artificial biosynthetic pathway by introducing 4 archaeal genes and 1 gene from Bacillus subtilis in the cells of Escherichia coli, which enabled the E. coli strain to produce hyperextended C25,C30-archaeal membrane lipids, which have never been reported so far.

Acute Renal Failure Due to Postpartum Haemolytic Uraemic Syndrome

1988 ◽  
Vol 28 (3) ◽  
pp. 228-230 ◽  
Author(s):  
Philip K.T. Li ◽  
Fernand Mac-Moune Lai ◽  
John S.L. Tarn ◽  
Kar Neng Lai
Keyword(s):  
Renal Failure ◽  
Acute Renal Failure ◽  
Haemolytic Uraemic Syndrome

scholarly journals Evaluation of Physiological Effects Induced by Manuka Honey Upon Staphylococcus aureus and Escherichia coli

2019 ◽  
Vol 7 (8) ◽  
pp. 258 ◽  
Author(s):  
Patricia Combarros-Fuertes ◽  
Leticia M. Estevinho ◽  
Rita Teixeira-Santos ◽  
Acácio G. Rodrigues ◽  
Cidália Pina-Vaz ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Membrane Potential ◽  
Membrane Integrity ◽  
Efflux Pumps ◽  
Coli Strain ◽  
Antibacterial Action ◽  
Manuka Honey ◽  
E Coli ◽  
Action Mechanisms

Several studies have explored the antimicrobial properties of manuka honey (MkH). However, the data available regarding antibacterial action mechanisms are scarcer. The aim of this study was to scrutinize and characterize primary effects of manuka honey (MkH) upon the physiological status of Staphylococcus aureus and Escherichia coli (as Gram-positive and Gram-negative bacteria models, respectively), using flow cytometry (FC) to reveal its antibacterial action mechanisms. Effects of MkH on membrane potential, membrane integrity and metabolic activity were assessed using different fluorochromes in a 180 min time course assay. Time-kill experiments were carried out under the same conditions. Additionally, MkH effect on efflux pumps was also studied in an E. coli strain with an over-expression of several efflux pumps. Exposure of bacteria to MkH resulted in physiological changes related to membrane potential and membrane integrity; these effects displayed slight differences among bacteria. MkH induced a remarkable metabolic disruption as primary physiological effect upon S. aureus and was able to block efflux pump activity in a dose-dependent fashion in the E. coli strain.

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