About 29,000 people got sick and 68 died in 2011 and 2012, according to the latest figures released by the Centers for Disease Control and Prevention.
The agency attributed 41-percent of the outbreaks to the norovirus, and about a third to salmonella. The CDC linked sit-down restaurants to more than half of the outbreaks traced to a single food preparation site.
The most common single food categories implicated were fish, vegetables such as lettuce, and unpasteurized dairy .
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