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<div>{{Escherichia coli O157:H7}}<br />
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[[''Escherichia coli O157:H7''. Image courtesy of [http://www.about-ecoli.com/E-bug.gif OutBreak, Inc]. Copyright 2005 - 2007.]]<br />
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==Classification==<br />
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Phylum: Proteobacteria<br />
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Class: Gamma Proteobacteria<br />
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Order: Enterobacteriales<br />
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Family: Enterobacteriaceae<br />
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Genus: Escherichia<br />
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Species: E. coli <br />
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==Description==<br />
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Escherichia coli O157:H7 is an enterohemorrhagic strain of the bacterium Escherichia coli.[1] Escherichia coli O157:H7 is one of the four recognized classes of enterovirulent E. coli which can cause gastroenteritis in human.<br />
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==Unique characteristics==<br />
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Escherichia coli O157:H7 has some Unique characteristics: c<br />
Cannot metabolize sorbitol <br />
Poor growth at 44-45.5 °C <br />
Lacking beta-glucuronidase activity <br />
Tolerates low pH well [2]<br />
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==Toxicity==<br />
E. coli O157:H7 infection often causes severe bloody diarrhea and abdominal cramps; sometimes the infection causes non-bloody diarrhea or no symptoms. Vomiting occurs in about half of persons and fever, usually not high, occurs less than one-third of the time. On the second or third day of illness, stools may become bloody in 30% to 75% of cases. The illness resolves in 5 to 10 days. Infants and the elderly are most susceptible. The incubation period is usually 3-4 days, although rarely the incubation can be as short as 12 hours or as long as 8 days. Most of the time there is no long-term effects. Asymptomatic infection can occur.[3]<br />
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==Treatment==<br />
Antibiotics are not used with this type of infection. Most people usually recovery within five to 10 days. Sometimes people will develop hemolytic uremic syndrome (HUS),life-threatening disease. Blood transfusions and kidney dialysis can treat HUS.<br />
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==References==<br />
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1. Karch H, Tarr P, Bielaszewska M (2005). Enterohaemorrhagic Escherichia coli in human medicine. Int J Med Microbiol 295 (6-7): 405–18. PMID 16238016.<br />
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2. Geoff Copper, Rebecca Young, Claire Campbell,. Guyton Durnin, Linha Phan, Leah McKay. (2006) Escherichia coli O157:H7 <br />
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3. CALVIN B. JOHNSON (2006).Escherichia coli O157:H7 (E. Coli)</div>Pichiang