SAN RAFAEL, CA - SEPTEMBER 15: A sign is seen posted in the produce section of United Market alerting customers that all bagged fresh spinach has voluntarily been removed from shelves September 15, 2006 in San Rafael, California. The source of an E. coli outbreak linked to bagged fresh spinach that spread to 20 states, sickening 90 people, was identified by the FDA as distributor Natural Selection Foods/Earthbound Farm based in San Juan Bautista, California, according to media reports. (Photo by Justin Sullivan/Getty Images)
