In Colorado, 10 people were hospitalized and one elderly person died from E. coli infections linked to McDonald's Quarter Pounder burgers. The Centers for Disease Control says: on tuesday.
McDonald's stock fell 9.2% after the bell.
McDonald's has proactively removed the shredded onions and beef patties used in the Quarter Pounder burger from its stores in the affected states while the investigation continues, the company informed the CDC.
Quarter Pounders may be temporarily unavailable in some states, the CDC said in a statement.
McDonald's did not respond to Reuters' request for comment.
