A novel sequence of 2.9 kb in the intergenic region between the mutS and rpoS genes of Escherichia coli O157:H7 and closely related strains replaces a sequence of 6.1 kb in E. coli K-12 strains. At the same locus in Shigella dysenteriae type 1, a sequence identical to that in O157:H7 is bounded by the IS1 insertion sequence element. Extensive polymorphism in the mutS-rpoS chromosomal region is ...

Escherichia coli O157:H7 is an important food-borne pathogen and cause of hemorrhagic colitis and hemolytic uremic syndrome in humans. Cattle are an important reservoir of E. coli O157:H7, in which the organism colonizes the intestinal tract and is shed in the feces. Vaccination of cattle has significant potential as a pre-harvest intervention strategy for E. coli O157:H7; however, basic inform...

Escherichia coli O157:H7 is an important food-borne pathogen and cause of hemorrhagic colitis and hemolytic uremic syndrome in humans. Cattle are an important reservoir of E. coli O157:H7, in which the organism colonizes the intestinal tract and is shed in the feces. Vaccination of cattle has signifi cant potential as a pre-harvest intervention strategy for E. coli O157:H7; however, basic infor...

BACKGROUND AND OBJECTIVE Escherichia coli O157:H7, an emerging pathogen, causes severe enteritis and the extraintestinal complication of hemolytic-uremic syndrome. The goal of this study was to evaluate the conjugate of E. coli O157: H7 lipopolysaccharide (LPS) with diphtheria toxoid (DT) as a candidate vaccine in mice model. MATERIAL AND METHODS LPS from E. coli O157:H7 was extracted by hot ...

A bacteriophage, EC6, capable of lysing Escherichia coli serotype O157:H7 was isolated and found to be a member of the family Myoviridae. The genomic sequence of phage EC6 was composed of 86,231 bp with a G+C content of 38.9% and is very similar to the sequences of Escherichia phage wV8 and Salmonella phage Felix O1.

Leafy green produce has been associated with numerous outbreaks of foodborne illness caused by strains of Escherichia coli O157:H7. While the amounts of culturable E. coli O157:H7 rapidly decline after introduction onto lettuce in the field, it remains to be determined whether the reduction in cell numbers is due to losses in cell viability, cell injury and a subsequent inability to be detected...

W e have read with interest the Letter to the Editor by Ahmed and Abouzeed reporting on the important issue of enterohemorrhagic Escherichia coli O157 (EHEC O157) in dairy cattle in Libya (1). Based on two cited references, the authors state that: ‘‘Surveys of diarrheal stools from children in African nations, including Libya, have detected EHEC O157 in 8 15% of the samples’’. One of the cited ...

objective: escherichia coli (e.coli) o157:h7 is one of the most important pathogenic causes of hemorrhagic colitis in humans. cattle are the main reservoirs of this bacteria and vaccination is a key mechanism for its control. the intimin, translocated intimin receptor (tir), and espa proteins are virulence factors expressed by the lee locus of enterohemorrhagic e. coli. espa protein is a member...

conclusions due to the presence and potential hazard of e. coli o157:h7, l. monocytogenes, and salmonella spp. in meat samples, the detection of these pathogens in different kinds of meat is crucial to safeguard public health. results l. monocytogenes was detected in 2.8% of beef and buffalo samples and 4.3% of lamb samples. e. coli o157:h7 was detected in 2.8% of beef and 1.4% of buffalo sampl...

Outbreaks associated with leafy greens have focused attention on the transfer of human pathogens to these commodities during harvest with commercial equipment. Attachment of Escherichia coli O157:H7 on new or rusty spinach harvester blades immersed in spinach extract or 10% tryptic soy broth (TSB) was investigated. Bacteriophages specific for E. coli O157:H7 were evaluated to kill cells attache...