The Wall Street Journal: Tainted romaine lettuce traced back to central California

Food regulators are closing in on the source of the E. coli outbreak that shut down the romaine lettuce market last week, and are asking producers to change the way they label the leafy salad green.

The U.S. Food and Drug Administration and the federal Centers for Disease Control and Prevention last week issued an unusually broad warning to consumers not to eat romaine lettuce and advised restaurants and retailers not to serve or sell the lettuce until more is known.

On Monday, the FDA said the contaminated lettuce was likely grown in the central coast region in California, where the vast majority of lettuce originated at the time of the outbreak.

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