All about the deadly E. coli outbreak linked to McDonald's Quarter Pounders

This particular strain produces toxins that can lead to serious foodborne infections.

A concerning outbreak of Escherichia coli (E. coli) has been linked to McDonald's Quarter Pounder hamburgers, leaving one person dead and 49 others ill, according to the Centers for Disease Control and Prevention (CDC). The outbreak primarily affected residents in Colorado and Nebraska, with the likely source being slivered onions used in the burgers. The CDC, along with the Food and Drug Administration (FDA), is investigating the possibility of contamination in the hamburger patties as well.

What is E. coli?

E. coli is a type of bacteria commonly found in the intestines of humans and animals. While many strains are harmless and contribute to gut health, some, like E. coli O157, can cause severe illness. This particular strain produces toxins that can lead to serious foodborne infections.

Symptoms of E. coli Infection

Infections caused by harmful strains of E. coli typically result in symptoms such as:

• Severe stomach cramps
• Diarrhoea, which is often bloody
• Vomiting
• Mild fever (though fever may not always be present)

McDonald's Response and Public Health Investigation

Following the CDC's findings, McDonald's temporarily halted the sale of Quarter Pounders in 12 states, including Colorado, Nebraska, Kansas, and Utah, as a precautionary measure. The fast-food giant also stopped using the suspect onions in its food preparation while investigations continue. So far, 10 people have been hospitalised, including a child with a complicating illness.

Meanwhile, Taylor Farms, a major supplier to McDonald’s, has initiated a recall of certain batches of yellow onions produced at its Colorado facility in connection with an ongoing E. coli outbreak linked to the fast-food chain. The recall was prompted by a multistate investigation by the CDC and the FDA, though the company has yet to find direct evidence of E. coli contamination in its products.

In a precautionary move, Taylor Farms decided to withdraw the onions from the market, citing its commitment to food safety. The company stated: "Taylor Farms Colorado removed yellow onions from the market produced out of our Colorado facility. We continue to work closely with the FDA and CDC during this ongoing investigation." Another major customer of Taylor Farms, US Foods Holding Corp., also directed at least one restaurant to discard the onions as a preventive measure.

The CDC warned that the true number of cases might be underreported, as many individuals recover without seeking medical treatment. The public is urged to seek medical attention if they experience symptoms like diarrhoea lasting more than three days, high fever, or signs of dehydration.