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 causative agent -: (A) 0157:H7, (B) 0 159:H7, (C) 0107:H7, (D) 0 55:H7
Answer is A. Ans. is 'a' i.e., 0 157 : H7 . Amongst E. coli, Enterohemorrhagic E. coli causes heamorrhagic colitis and the typical EHEC is serotype 0157: H7. Remember . Few other serotype such as 026 : Hl also belongs to this category.