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Tomatoes are displayed for sale at a grocery store in Washington, D.C., as rising produce prices have become a focus of grocery inflation. Photo: Al Drago/Getty Images

A growing diarrhea outbreak has put fresh produce under scrutiny as investigators continue to search for the source of the crisis.

Why it matters: Investigators still haven't identified a common contamination source for the cyclosporiasis outbreak, limiting the guidance health officials can give consumers as the outbreak grows.