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General Medicine General 58a5500b

A 20 year old man presented with abdominal pain, vomiting and bloody diarrhea, his stool sample grew Escherichia coli in pure culture. Which of the following serotype of E.coli is the causative agent of hemorrhagic colitis?

A
O 157:H7
B
O 159:H7
C
O 107:H7
D
O 55:H7

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