Friday, August 19, 2011

A case of bloody diarrhea


Today we discussed a case of bloody diarrhea caused by Enterohemorrhagic E. coli (EHEC), strain O157: H7.

Patients with this infection generally present with bloody diarrhea, mild leukocytosis, abdominal pain, but no fever. This bacteria produces a toxin called the Shiga toxin which can result in the dreaded Hemolytic-uremic syndrome (HUS)- the major systemic complication of EHEC infection. HUS is characterized by the triad of acute renal failure, microangiopathic hemolytic anemia, and thrombocytopenia

The treatment of EHEC infection consists of supportive care and monitoring for the development of microangiopathic complications. Administering antibiotic therapy to patients with EHEC is not recommended (Grade 1B- though the evidence is only in children <10).

Here is a review article on the topic.

Escherichia coli O157:H7 and the hemolytic-uremic syndrome.Boyce TG, Swerdlow DL, Griffin PM. N Engl J Med. 1995;333(6):364.

* Romanian greenhouse employees destroy tons of cucumbers for fear of E. coli. In May 2011, a new Shiga toxin-producing EHEC strain, O104:H4, was identified as the cause of an outbreak in Germany and other countries in Europe.


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