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Ask Tufts Experts February 2007 Issue

Q: I read the article “How Safe Are Your Salad Greens?” (December 2006 Healthletter) with great interest. Will washing fruits and vegetables in vinegar and water kill E. coli? If so, how much vinegar to water should be used?

Answer :Nothing short of cooking will guarantee that E. coli on produce has been killed, but some research does suggest vinegar washing can reduce contamination of fresh produce. Research at the University of Nebraska led scientists there to recommend soaking produce in full-strength white vinegar for five minutes, stirring occasionally. Rinse with clean tap water to remove vinegar flavor. Wash only what you need immediately, as washing earlier could give remaining bacteria time to grow.

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