E. coli outbreak tied to McDonald's Quarter Pounder kills 1, sickens dozens in US
McDonald's removes slivered onions and beef patties from several stores
Restaurants impacted are in Colorado, Kansas, Utah and Wyoming
Shares fall 6% after hours
Adds details on E. coli strain in paragraphs 2 and 13, expert comment in paragraphs 8-10
By Lisa Baertlein and Sneha S K
Oct 22 (Reuters) -One person has died and dozens were sickened fromE. coli infections linkedto McDonald's MCD.N Quarter Pounder hamburgers in 10 states, the U.S. Centers for Disease Control said on Tuesday.
Shares of the company were down about 6% in extended trading after the CDC said 49 people were sickened by the E. coli O157:H7 strain, which can cause serious illness and is perhaps most often associated with a 1993 outbreak that killed four children who ate undercooked hamburgers at Jack in the Box JACK.O restaurants.
Everyone interviewed has reported eating at McDonald's before their illness started, and most mentioned eating a Quarter Pounder hamburger, according to the CDC.
The specific ingredient linked to the illness has not yet been identified but investigators are focused on fresh, slivered onions and fresh beef patties, the CDC said.
Most of the illnesses were reported in Colorado and Nebraska.
"The 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 North America Chief Supply Chain Officer Cesar Piña said in a statement.
McDonald's has proactively removed the slivered onions and beef patties used for the Quarter Pounder hamburgers from stores in the affected states while the investigation continues, the company informed the CDC.
Top U.S. food safety attorney Bill Marler, who represented a victim in the Jack in the Box outbreak, said onions are the most likely source of contamination and have been linked to prior E. coli O157:H7 outbreaks.
Beef seems unlikely, because those outbreaks have become uncommon due to food safety measures, said Marler, a founder of Marler Clark in Seattle.
"You'd have to have multiple restaurants under cooking the meat," said Marler, who expects to see more cases reported in the outbreak.
McDonald's is temporarily removing the Quarter Pounder from restaurants in the impacted area, including Colorado, Kansas, Utah and Wyoming, it said in a statement, adding it was working with suppliers to replenish supply in the coming week.
Symptoms for E. coli include severe stomach cramps, diarrhea and vomiting.
In 2015, burrito chain Chipotle CMG.N saw its sales battered and reputation hit due to E.coli outbreaks in several states. That outbreak was linked to the E. coli O26 strain that usually causes less severe illness than E. coli O157:H7.
Reporting by Sneha S K and Jaiveer Shekhawat in Bengaluru and Lisa Baertlein in Los Angeles; Editing by Sriraj Kalluvila and Lisa Shumaker
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