Enterohemorrhagic Escherichia coli (EHEC) are responsible for major outbreaks of bloody diarrhea and hemolytic uremic syndrome (HUS) throughout the world. The mortality associated with EHEC infections stems from the production and release of a potent Shiga toxin (Stx) by these bacteria.
What bacteria causes EHEC?
EHEC is a strain of E. coli that produces a toxin called Shiga toxin. The toxin causes damage to the lining of the intestinal wall. In 1982, EHEC was found as the cause of bloody diarrhea that developed after eating undercooked or raw hamburger meat contaminated with the bacteria.
How does EHEC cause bloody diarrhea?
They are some of the most common strains to cause severe food-related illness in people. It’s different from other E. coli because it makes a potent toxin called shiga toxin. This toxin damages the lining of the intestinal wall, causing bloody diarrhea.
What is the difference between EHEC and STEC?
EHEC is a subset of STEC strains that can cause hemorrhagic colitis (HC). HC and the strains that cause it are of primary concern to food establishments because the disease can progress to hemolytic uremic syndrome (HUS), a potentially fatal illness.
What is the difference between EHEC and ETEC?
Both ETEC and EHEC infections are typically acquired through the ingestion of contaminated food or water (Figure 1). However, a major difference between ETEC and EHEC is that ETEC only have a human reservoir of infection while EHEC are zoonotic pathogens [2, 9].
How does Shiga toxin cause Diarrhoea?
EHEC strains are unique in their ability to produce Shiga toxin type 1 (STX1) and type 2 (STX2) encoded by stx1 and stx2 genes, respectively, which cause non-bloody and bloody diarrhea as a result of a cytotoxic effect on the capillary endothelium [1–4].
What is shiga toxin producing E. coli?
Definition. Shiga toxin-producing Escherichia coli (STEC) are bacteria that can cause bloody diarrhea in infected people. In rare cases, the same bacterium can also cause a kidney disease known as Hemolytic Uremic Syndrome. The most well known member of this group of bacteria is E.
What are the symptoms of Shiga toxin?
Symptoms of STEC infections can vary, but most often include severe diarrhea (loose stool/poop), stomach cramps, and vomiting. Diarrhea is often bloody and usually little or no fever is present.
Is Shiga toxin destroyed by heat?
Shiga toxin Stx2 is heat-stable and not inactivated by pasteurization.
What is shiga toxin producing E coli?
Are VTEC and STEC the same?
Shigatoxigenic Escherichia coli (STEC) and verotoxigenic E. coli (VTEC) are strains of the bacterium Escherichia coli that produce either Shiga toxin or Shiga-like toxin (verotoxin). Only a minority of the strains cause illness in humans. The ones that do are collectively known as enterohemorrhagic E.
How is enterohemorrhagic E coli (EHEC) Shiga toxin diagnosed?
Detection of enterohemorrhagic E coli Shiga toxins by enzyme immunoassay (EIA) Treatment of patients infected with Enterohemorrhagic E coli (EHEC) with antibiotics is contraindicated. Hemorrhagic colitis can be differentiated from other causes of diarrhea by its progression from watery to bloody diarrhea during a few days’ time.
What does EHEC stand for?
Enterohemorrhagic E coli (EHEC) Shiga Toxin, EIA 1 E coli O157 2 EHEC, Stool Culture 3 Shiga Toxin
How serious is an EHEC infection?
Between 5% and 10% of those with an EHEC infection develop hemolytic uremic syndrome. This is a serious complication which may cause the kidneys to stop working due to the destruction of red blood cells and can be life threatening. Can an EHEC infection be prevented?
What foods are associated with EHEC?
Since that time, outbreaks of EHEC have been linked with other types of foods, such as spinach, lettuce, sprouts, unpasteurized milk, unpasteurized apple juice or apple cider, salami, and well water or surface water areas frequently visited by animals.
