A health inspection grade is posted outside a Manhattan eatery. In several cities, Yelp users can now find out how a restaurant scored on its health inspection well before they walk through the door. Mario Tama/Getty Images hide caption

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The Centers for Disease Control and Prevention's PulseNet service monitors clusters of sickness linked to potentially dangerous strains of foodborne pathogens such as E.coli or salmonella. Reed Saxon/AP hide caption

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Customers line up for an ice cream van at the 2011 Glastonbury Music Festival in southwest England. Matt Cardy/Getty Images hide caption

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The famed Noma restaurant in Copenhagen has been blamed for more than 60 of its diners falling ill. Investigators say an illness spread from the staff to the customers. Keld Navntoft/AFP/Getty Images hide caption

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Spinach has lots of opportunities to pick up E. coli and other bugs during harvest and growing. Here, a Mexican migrant worker cuts organic spinach during the fall harvest at Grant Family Farms in Wellington, Co. John Moore/Getty Images hide caption

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Owner Eric Jensen examines cantaloupe on the Jensen Farms near Holly, Colo., last month.

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A fast-growing segment of the fruit market, pre-cut salad, is getting caught up in the cantaloupe listeria recall

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