(Bloomberg) — Consumers can resume buying and eating fresh spinach after an outbreak of E. coli that killed one person and sickened 188 in the U.S. and Canada, the U.S. Food and Drug Administration said.“Spinach on the shelves is as safe as it was before this event,” said David Acheson, chief medical officer for the FDA Center for Food Safety and Applied Nutrition, today on a conference call with reporters. All brands that were affected have been recalled, the agency said.The tainted spinach all came from Natural Selection Foods LLC, a San Juan Bautista, California-based vegetable grower and processor, Acheson said. The company on Sept. 15 recalled all of its spinach products with use-by dates of Aug. 17 to Oct. 1. Four U.S. distributors, all of which said they bought their spinach from Natural Selection, subsequently recalled their products.“The FDA is not preventing other spinach from coming back on the market,” Acheson said, adding that this applies to products from Natural Selection which don’t fall within the recall dates.20th OutbreakSeven bags of Dole-brand spinach — which were included in the Natural Selection recall — tested positive for the outbreak strain of E. coli in Colorado, Indiana, Nevada, New Mexico, Pennsylvania, Utah and Wisconsin, Acheson said. Two more bags of Dole spinach in Pennsylvania and Wisconsin are likely to test positive, he said.Dole Food Co. and Natural Selection didn’t immediately return calls for comment.The FDA and the state of California have called on the industry to come up with a “comprehensive plan” to prevent future E. coli outbreaks in leafy vegetables, Acheson said, noting that this was the 20th outbreak from leafy vegetables in about a decade, and about half of those trace back to central California.“It is not appropriate for FDA to look at this outbreak in isolation,” he said. “It raises concerns about what is going on in that environment. At this stage, it’s very important that industry take the initiative to come up with a plan to address the underlying concerns and problems.”Investigators are still trying to determine how the spinach became contaminated, though Acheson said that they may never know.SymptomsFood contamination from the strain of E. coli blamed in the current cases affects about 73,000 peo