A multi-state outbreak of E. Coli O157:H7 infections linked to McDonald’s Quarter Pounder hamburgers has sickened at least 49 people across 10 states, with one death reported in Colorado. The Centers for Disease Control and Prevention (CDC) is investigating the source of the outbreak, focusing on fresh slivered onions and beef patties used in the popular burger.
As of , the CDC reported that 10 people have been hospitalized, and one child is being treated for hemolytic uremic syndrome (HUS), a severe complication that can lead to kidney failure. The majority of reported illnesses are concentrated in Colorado (26 cases) and Nebraska (9 cases). All individuals interviewed by investigators reported consuming food at McDonald’s prior to becoming ill, with the Quarter Pounder hamburger frequently mentioned.
Understanding E. Coli O157:H7
Escherichia coli (E. Coli) is a diverse group of bacteria, most of which are harmless. However, certain strains, like O157:H7, produce Shiga toxins that can cause severe illness. These Shiga toxin-producing E. Coli (STEC) are a leading cause of foodborne illness in the United States. According to food safety microbiologist Prashant Singh of Florida State University, this particular strain is “the dying kind,” underscoring the potential severity of infection.
Symptoms and Risks
Symptoms of STEC infection typically begin 3 to 4 days after exposure and include severe stomach cramps, diarrhea (often bloody), and vomiting. While most individuals recover within 5 to 7 days without treatment, some, particularly young children and older adults, are at higher risk of developing serious complications like HUS. HUS can cause permanent kidney damage and even death.
McDonald’s Response and Investigation
In response to the outbreak, McDonald’s has proactively removed the implicated slivered onions and beef patties from stores in affected states. Quarter Pounder hamburgers may be temporarily unavailable in some locations while the investigation continues. The Food and Drug Administration (FDA) is working with the CDC and state partners to trace the source of the contamination, collecting and analyzing samples of onions and reviewing distribution records.
Company spokespeople have indicated that if onions are confirmed as the source, it would be the first time this particular strain of E. Coli has been linked to onions. They also emphasized that the onions used in Quarter Pounders came from suppliers who routinely test for E. Coli.
What to Do If You’re Concerned
Individuals who have consumed a Quarter Pounder hamburger at McDonald’s and are experiencing severe symptoms of E. Coli infection – including bloody diarrhea, severe stomach cramps, and vomiting – are advised to seek medical attention immediately and inform their healthcare provider about their recent food consumption.
The CDC recommends that anyone experiencing these symptoms should consult a doctor. Early diagnosis and supportive care are crucial, especially for those at higher risk of developing HUS.
Preventing E. Coli Infection
While this outbreak is linked to a specific food source, understanding general prevention measures is important. E. Coli can spread through contaminated food or water, or by contact with the feces of animals or infected individuals. Thoroughly cooking meat, washing fruits and vegetables, and practicing good hygiene – including frequent handwashing – are essential steps in preventing infection.
The CDC provides comprehensive information about E. Coli infection, including symptoms, prevention, and treatment, on its website: https://www.cdc.gov/ecoli/about/index.html. State health departments are also available to answer questions about cases within their jurisdictions.
This is a developing situation, and the CDC and FDA will continue to provide updates as the investigation progresses. Consumers are encouraged to stay informed and follow the guidance of public health officials.
