The slivered onions supplier used dirty equipment that led to cross-contamination, the FDA said, and employees failed to meet other sanitation standards, including proper hand washing.

The onion supplier behind a deadly E. coli outbreak linked to McDonald's Quarter Pounders this past fall had numerous health and sanitation violations, including employees with unwashed hands, dirty equipment,

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FDA inspectors reported that employees who worked with food did not wash their hands or maintain hygiene, stated CBS News.

A new report from the Department of Health and Human Services shows inspectors observed a number of violations at that facility following the outbreak.