The 2024 McDonald's E. coli outbreak was an outbreak from September to October 2024 involving contaminated slivered onions on Quarter Pounders sold at McDonald's stores in 14 U.S. states. At least 104 people contracted Escherichia coli, and one person died.[2]
| 2024 McDonald's E. coli outbreak | |
|---|---|
 U.S. states affected by outbreak | |
| Bacteria strain | Escherichia coli O157:H7 |
| Source | Slivered onions used on Quarter Pounders at McDonald's restaurants |
| Location | United States |
| First reported | October 22, 2024 |
| Date | September 12 – October 21, 2024[1] |
| Confirmed cases | 104 |
| Hospitalized cases | 34 |
Deaths | 1 |
Outbreak
editThe Food and Drug Administration (FDA) issued a public warning through its Coordinated Outbreak Response & Evaluation Network (CORE Network) about the E. coli outbreak on October 22. Their initial investigation noted 49 cases of E. coli throughout 10 U.S. states (Colorado, Kansas, Utah, Wyoming, and portions of Idaho, Iowa, Missouri, Montana, Nebraska, Nevada, New Mexico, and Oklahoma). The Centers for Disease Control and Prevention (CDC) at the time did not confirm the origin, but the government agency suspected it was either slivered onions or beef patties.[3][4] An update to the investigation was published on October 25 with 26 new cases, 12 new hospitalizations, and 3 new U.S. states (Oregon, Washington, and Utah).[5]
On October 22, McDonald's stores in the affected states temporarily removed the Quarter Pounder from the menu or stopped serving it with the specific slivered onions and beef patties.[3][6] The Colorado Department of Agriculture (CDA) laboratories analyzed subsamples from all the lots of McDonald's brand fresh and frozen beef patties collected from various McDonald's locations in Colorado and found them to be negative for E. coli.
On October 23, a man who fell ill after eating a sandwich at the fast food chain's Greeley, Colorado location filed a lawsuit against McDonald's over an E. coli outbreak linked to its Quarter Pounder burgers. The lawsuit is one of the first in the case.[7]
A second update on the investigation was published on October 30, stating that epidemiologic and traceback information shows that fresh, slivered onions were the likely source of illness in this outbreak.[3][8] The Food Safety and Inspection Service (FSIS) performed a traceback of beef patties served on Quarter Pounders at McDonald's, and evidence did not point to ground beef as the likely source of contamination.[3] The Food and Drug Administration is looking into a Washington onion "grower of interest".[9]
A third update was published on November 13, adding 14 new cases, 7 new hospitalizations, and North Carolina to the affected states.[1] The FDA tested recalled onions in which one sample tested positive for non-O157:H7 Shiga toxin-producing E. coli. The E. coli found was not the outbreak strain. A fourth and final update was published on December 3, with no additional cases. The CDC declared the outbreak over.[4][10]
Infection
editEscherichia coli O157:H7 is a serotype of the bacterial species Escherichia coli and is one of the Shiga-like toxin–producing types of E. coli. It is a cause of disease, typically foodborne illness, through consumption of contaminated and raw food, including raw milk and undercooked ground beef.[11][12]
Responses
editOn October 25, Taylor Farms, the supplier of the slivered onions to the affected stores, initiated a voluntary recall on yellow onions.[5][6] While there were growers of interest that supplied Taylor Farms, FDA has not been able to implicate the specific grower.[13]
On December 3, 2024, the CDC declared the outbreak was "over," and the FDA announced they had closed their investigation.[10]
References
edit- ^ a b "When People Got Sick: E. coli Outbreak, Onions Served at McDonald's". CDC. November 13, 2024. Retrieved November 13, 2024.
- ^ Foster, Robin (November 14, 2024). "E. Coli Illnesses Linked to McDonald's Quarter Pounders Climb to 104". U.S. News & World Report. p. 1. Retrieved November 14, 2024.
- ^ a b c d "E. coli Outbreak Linked to McDonald's Quarter Pounders". Centers for Disease Control and Prevention (CDC). October 22, 2024. Retrieved October 23, 2024.
- ^ a b "Outbreak Investigation of E. coli O157:H7: McDonald's Quarter Pounders (October 2024)". Food and Drug Administration (FDA). October 22, 2024. Retrieved December 4, 2024.
- ^ a b "Investigation Update: E. coli Outbreak, McDonald's Quarter Pounders - October 22, 2024". CDC. October 25, 2024. Retrieved October 25, 2024.
- ^ a b "Sobe para 75 número de contaminados por E.coli em McDonald's dos EUA; uma pessoa morreu". G1 (in Portuguese). October 25, 2024. Retrieved October 26, 2024.
- ^ "McDonald's é processado por homem que adoeceu com surto de E. coli nos EUA". G1 (in Portuguese). October 24, 2024. Retrieved October 25, 2024.
- ^ Rajesh, Ananya Mariam (October 31, 2024). "Onions were likely source of McDonald's E. coli outbreak, US CDC says". Reuters. Retrieved November 2, 2024.
- ^ Edwards, Erika; Lovelace Jr., Berkeley (October 30, 2024). "CDC says slivered onions probably caused McDonald's E. coli infections as cases rise to 90". NBC News. Retrieved November 1, 2024.
- ^ a b Edwards, Erica (December 3, 2024). "McDonald's E. coli outbreak is over, CDC says". NBC News. Retrieved December 4, 2024.
- ^ Gally DL, Stevens MP (January 2017). "Microbe Profile: Escherichia coli O157:H7 - notorious relative of the microbiologist's workhorse" (PDF). Microbiology. 163 (1): 1–3. doi:10.1099/mic.0.000387. PMID 28218576.
- ^ Karch H, Tarr PI, Bielaszewska M (October 2005). "Enterohaemorrhagic Escherichia coli in human medicine". International Journal of Medical Microbiology. 295 (6–7): 405–18. doi:10.1016/j.ijmm.2005.06.009. PMID 16238016.
- ^ "FDA Unable to Implicate Grower in E. coli Outbreak Linked to Taylor Farms Onions Served at McDonald's | Food Safety". Food Safety Magazine. November 8, 2024. Retrieved November 12, 2024.
Although a Taylor Farms facility in Colorado Springs, Colorado was confirmed as the supplier of the onions to McDonald's, and FDA was investigating an onion grower of interest in Washington state, FDA has been unable to definitively implicate a grower.