McDonald's Quarter Pounders linked to E. Coli outbreak, 1 death

McDonald's shares dropped over 9% in after-hours trading to $286.27 following reports of an E. coli outbreak linked to its Quarter Pounder.

The CDC has identified 49 cases across 10 states, resulting in 10 hospitalizations and one death.

"Most people in this outbreak are reporting eating the Quarter Pounder hamburger at McDonald’s before becoming sick," the CDC stated.

Investigators are still determining the contaminated ingredient. McDonald's is cooperating and has halted sales of shaved onions and quarter-pound patties in several states, primarily Colorado and Nebraska.