McDonald’s shares fall after CDC says E. coli outbreak linked to Quarter Pounders

McDonald’s shares dropped in extended trading Tuesday after the Centers for Disease Control and Prevention said an E. coli outbreak linked to McDonald’s Quarter Pounder burgers has led to 10 hospitalizations and one death.

In a release, the agency said the outbreak has hit 10 states. “Most” sick people reported eating a McDonald’s Quarter Pounder, the CDC added.

Investigators are working to determine which ingredient may be contaminated, and McDonald’s has withdrawn ingredients for the burgers, the CDC said.

McDonald’s shares dropped about 9% in after-hours trading Tuesday.

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