This is not the first foodborne illness outbreak linked to onions.
In 2023, there was a Salmonella outbreak linked to chopped fresh onions from a CA processor. (link)
In 2021, a Salmonella outbreak with 652 was linked to imported onions. (link)
In 2020, a Salmonella outbreak with 1,127 cases (link)
FDA published their investigation into the 2020 outbreak, and stated potential causes. If considering how contamination events can occur to an item like onions, one can reflect on this.
While our investigation did not occur during any harvesting activities, visual observations of the implicated red onion growing fields suggested several plausible opportunities for contamination including irrigation water, sheep grazing on adjacent land, as well as signs of animal intrusion, such as scat and large flocks of birds which may spread contamination. Similarly, the investigation did not occur while packing activities were ongoing. However, visual observations and records review of packing house practices confirmed numerous opportunities for spread of foodborne pathogens such as Salmonella, including signs of animal and pest intrusion as well as food contact surfaces which had not been inspected, maintained, cleaned, or sanitized as frequently as necessary to protect against the contamination of produce.
CDC information on this outbreak.
Fast Facts
Cases: 75 (26 new)
Hospitalizations: 22 (12 new)
Deaths: 1 (0 new)
States: 13 (3 new)
Cases: 75 (26 new)
Hospitalizations: 22 (12 new)
Deaths: 1 (0 new)
States: 13 (3 new)
https://www.fda.gov/food/outbreaks-foodborne-illness/outbreak-investigation-e-coli-o157h7-mcdonalds-quarter-pounders-october-2024?utm_medium=email&utm_source=govdelivery
Outbreak Investigations & Safety Advisories
FDA Human Foods Program