Microbiology – MCQ 65 – Hemorrhagic colitis by E.coli

A 20 year old man presented with hemorrhagic colitis. The stool sample grew Escherichia coli in pure culture. The following serotype of E.coli is likely to be the causative agent :
A. O l57:H7
B. O 159:H7
C. O 107:H7
D. O 55:H7

Correct answer : A. O l57:H7

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