A passerby walks past a Chipotle restaurant in Seattle in November that closed following one of two E.coli outbreaks that sickened scores of people. Elaine Thompson/AP hide caption

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Chipotle Mexican Grill founder and CEO Steve Ells, shown here in an interview with The Associated Press last month, says the company intends to become a leader in food safety. Stephen Brashear/AP hide caption

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Ayesha Mumtaz inspects food during a raid on a backyard sweets factory in Lahore, Pakistan. Her campaign to clean up the kitchens and food factories of Pakistan has earned her the nickname "The Fearless One." Philip Reeves/NPR hide caption

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A woman washes dishes on the street in Hanoi, Vietnam. The World Health Organization says the burden of foodborne disease in Southeast Asia is one of the highest in the world. Luong Thai Linh/EPA/Landov hide caption

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A Chipotle Mexican Grill was closed in Boston on Tuesday. According to a Boston College spokesman, 120 students have gotten sick after eating at the fast-food chain. Scott Eisen/Getty Images hide caption

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Lettuce grows in a field in Gonzales, Calif. The Food and Drug Administration has released new food safety rules that cover farmers who grow fresh produce, as well as food importers. David Paul Morris/Getty Images hide caption

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The vast majority of reported cases of norovirus — the leading cause of foodborne disease outbreaks and illnesses across the country — have been linked to infected food industry workers. iStockphoto hide caption

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Peanut Corporation of America's then-president Stewart Parnell arrives at federal court in 2009. Parnell was sentenced Monday to 28 years in prison for his role in a deadly salmonella outbreak from tainted peanut butter products. Don Petersen/AP hide caption

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Frozen tuna lies on the ground at the Tsukiji fish market in Tokyo. The FDA recommends freezing raw fish before serving it in sushi as a way to keep it free of parasites. But as a recent outbreak of Salmonella in the U.S. highlights, freezing doesn't guarantee that raw sushi fish is pathogen-free. Koichi Kamoshida/Getty Images hide caption

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A clampdown on contamination in growing fields has pushed out wildlife and destroyed habitats. Adam Cole/NPR hide caption

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