Escherichia Coli O157:H7 Was First Observed in Fast-Food Hamburger Meat

question 2

Multiple Choice

Escherichia coli O157:H7 was first observed in fast-food hamburger meat. More recently, it has been associated with contamination of spinach and other vegetables. How did the spread of this strain from meat to vegetables happen?

• A) It picked up genes for plant virulence.
• B) Strain O157:H7 can grow as a plant endophyte.
• C) It has become a psychrotroph and can grow in refrigerated foods.
• D) It produces toxins that can survive on plant material.
• E) This bacterial strain has lost genes needed to grow in meat.

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