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.

According to the FDA, food debris was found on equipment supposedly fully cleaned at the Taylor Farms food production facility in Colorado that supplied slivered onions used at McDonald's. Investigators also discovered workers were only using proper hand sanitization processes sometimes.

Taylor Farms recalled thousands of onion cases and McDonald’s switched suppliers for affected locations. While the FDA noted no public health threats from its inspection findings, lawsuits from impacted customers continue. This incident highlights the importance of stringent food safety standards to prevent future risks.

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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.