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Pathogenic E

Question 23

Multiple Choice

Pathogenic E.coli strain O157:H7 evolved from a non-pathogenic strain as a result of this genetic change.


A) A mutation in a virulence gene.
B) A mutation that resulted in antibiotic resistance.
C) The acquisition of virulence genes from Shigella.
D) The use of antibiotic supplements in animal feeds.
E) A mutation that resulted in increased capsule production.

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