WASHINGTON (AP) -- Spinach found in the refrigerator of a person sickened by E. coli was contaminated with the bacteria, the "smoking gun" that investigators have sought for the origin of the deadly outbreak, health officials say.

Federal and state investigators on Wednesday focused their hunt to nine farms in California's greater Salinas Valley, said Dr. Mark Horton, the state public health officer. They also were checking processing plants, said Horton, who called the bag of tainted Dole baby spinach the "smoking gun" in the case.

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Now I couldn't make spinach dip. A lot of people will be afraid to eat salad now.