According to the CDC, external, start dates for when people became ill range from 12 September and 21 October.
The onions were directly distributed in many western and midwestern states, including Colorado, Iowa, and Kansas. Other areas were also affected, such as Oklahoma, Idaho, and New Mexico.
Onion and environmental samples from McDonald’s stores and distribution centres have been collected by the FDA, the Colorado Department of Agriculture, and the Colorado Department of Public Health and Environment.
Of those who have become ill, four people developed haemolytic uremic syndrome (HUS) – a rare kidney condition that can damage red blood cells.
The federal agency said that tests on the samples were ongoing, adding that it had completed onsite inspections at an onion grower in the state of Washington and at a Taylor Farms processing centre in Colorado.
In the FDA’s update, health officials said it was continuing to work with the food supplier and their customers.
“At this time, there does not appear to be a continued food safety concern related to this outbreak at McDonald’s restaurants,” the update said.
It added that it was “unlikely” the recalled onions were “sold to grocery stores or directly to consumers”.
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