McDonald’s Quarter Pounder hamburgers are being linked to an outbreak of E. coli that has sickened nearly 50 people in 10 states, killing one person, federal health officials said Tuesday. 

Most sick people reported eating Quarter Pounders from McDonald’s, and investigators are working to confirm which food ingredient is contaminated, according to the U.S. Centers for Disease Control and Prevention. 

A total of 49 cases have been reported so far. Most of the illnesses occurred in Colorado and Nebraska, with 26 sickened in the former and nine stricken in the latter, the CDC stated. Of the 26 sickened in Colorado, an older adult died, the CDC said. 

Another person developed hemolytic uremic syndrome, a serious condition that can cause kidney failure. The person who died is not the same same person with HUS.  

A total of at least 10 people have so far been hospitalized. 

Nine people were reported ill in the outbreak in Nebraska, with Utah and Wyoming reported four illnesses a piece. Other states reporting illnesses include Iowa, Kansas, Missouri, Oregon and Wisconsin.  

In a statement McDonald’s posted to its website, Cesar Piña, the company’s North America chief supply chain officer, said that “initial findings from the investigation indicate that a subset of illnesses may be linked to slivered onions used in the Quarter Pounder and sourced by a single supplier that serves three distribution centers.”

McDonald’s is cooperating with federal and state public health officials and has stopped using fresh slivered onions and quarter pound beef patties in several states, where the product will temporarily be unavailable, the CDC stated. 

Quarter pound beef patties are only used on Quarter Pounders and fresh slivered onions are primarily used on Quarter Pounder hamburgers and not other menu items, the CDC said.

The illnesses began at the end of September and the most recent occurred as of Oct. 11. 

It usually takes three to four weeks to determine if a sick person is part of an outbreak. Most people infected with the toxin-producing E. coli experience severe stomach crams, diarrhea and vomiting. Most recover without treatment after 5 to 7 days.

People are advised to call their health care provider if they ate a McDonald’s Quarter Pounder and have severe E. coli symptoms:

McDonald’s did not immediately respond to a request for comment. 

Chipotle Mexican Grill job applicants better get used to conversing with AI — their first interview could be with an artificial intellgence-powered system named “Ava Cado” rather than a human hiring manager. 

The fast-casual Mexican restaurant chain said Tuesday that it is partnering with Paradox, a maker of what the technology company calls “conversational” AI, to launch the new hiring platform. 

By collecting basic information about candidates, Ava will free up restaurant managers to focus on other tasks, according to the company. The AI can also schedule interviews and even make job offers in real time, the company said. Ava is also a polyglot and able to conduct interviews in English, Spanish, French and German. 

The new technology is expected to reduce the amount of time it takes Chipotle to hire an employee for an in-restaurant position by as much 75%, Chipotle said in a statement to CBS MoneyWatch. 

Chipotle plans to deploy the system across more than 3,500 restaurant locations in North America and Europe. The technology is currently being introduced at restaurants in a phased approach that’s expected to be complete by the end of October. 

In addition to collecting biographical information, Ava can engage with job applicants and answer their questions about the company, according to Chipotle. 

“Paradox operates as if we’ve hired additional administrative support for all our restaurants, freeing up more time for managers to support team members and provide an exceptional guest experience. We’re excited about the early improvements we’re seeing,” Chipotle chief human resources officer Ilene Eskenazi said in a statement. 

A number of other major restaurant chains, retailers and other companies have turned to Paradox’s AI hiring tech, including Applebee’s, McDonald’s, Panera Bread, Taco Bell and Wendy’s.

Although AI can expedite the hiring process, it can also be controversial as a recruiting tool. Some studies have found that it can lead to biased assessment of candidates and unintentionally discriminate against people based on their race or gender. 

To guard against the misuse of AI in hiring, New York City in 2021 passed a law that requires companies that use the technology to disclose its use to job candidates. Employers are also required to conduct annual third-party “bias audits” of their automated hiring systems to ensure the technology isn’t discriminating against certain types of candidates.