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Norovirus: Think Restaurants, Not Cruise Ships, CDC Says

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(NBC News) -- The nasty germ known as norovirus gets its bad rap from high-profile cruise ship outbreaks, like the Explorer of the Seas debacle that sickened nearly 700 people in January.

In reality, a new government analysis shows that you're more likely to get sick from the highly contagious gut bug in a far less exotic locale: at a local restaurant, spread by the (unwashed) hands of a food service worker.

Workers who fail to properly wash hands or use gloves and the 1 in 5 who come to work sick with diarrhea and vomiting every year help make norovirus the leading cause of foodborne disease outbreaks in the U.S., according to a new report by the Centers for Disease Control and Prevention.

Health officials called for better adherence to hand hygiene rules — and policies that provide paid sick leave for food service workers.

"The bottom line is that norovirus is one tough bug," CDC Director Tom Frieden told reporters Tuesday. "Everyone should be able to go out to eat without worrying whether their food is safe."

Foodborne norovirus now accounts for about a quarter of the 20 million annual cases linked to the group of viruses that cause acute gastrointestinal distress and general misery wherever they go. And it accounts for about half of norovirus cases with a single known cause. Between 2009 and 2012, there were 1,008 such outbreaks reported by 43 states, the CDC said.

Of the non-food norovirus outbreaks, 80 percent occur in nursing home and long-term care settings. Only about 1 percent can be blamed on cruise ships, the CDC estimated.

When CDC officials analyzed all the norovirus outbreaks submitted to the agency’s National Outbreak Reporting System, or NORS, over the four-year period, what they found was less than appetizing. Norovirus is spread through the fecal-oral route, when tiny particles of the virus are transmitted from hands to food, people or surfaces.

Restaurants were the setting for two-thirds percent of the foodborne outbreaks, followed by banquet and catering sites. Of 520 outbreaks where the cause of the contamination was known, food service workers were the source in 70 percent of them. Workers who touched ready-to-eat foods with bare hands were explicitly identified in more than half of those cases.

Food was almost always contaminated during preparation and raw food was the problem in 75 percent of cases with a known cause. The most frequently named foods were leafy greens like lettuce, fruits and mollusks.

Restaurant managers have a duty to make sure workers follow food handling rules — and to put sick leave policies in place that let workers stay home for two days after symptoms subside, Frieden said.

"We do know how to stop norovirus from contaminating our food," he said.

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