The Centers for Disease Control and Prevention (CDC) issued a food safety alert on Tuesday which said an E. coli outbreak linked to McDonald’s burgers has led to one death and ten hospitalizations. “Most people in this outbreak are reporting eating the Quarter Pounder hamburger at McDonald’s before becoming sick,” the alert read.

The Centers for Disease Control and Prevention and other federal agencies are investigating an E. coli outbreak linked to McDonald’s Quarter Pounders, sending McDonald’s stock down 7% in after-hours trading.

Shares in McDonald’s (NYSE:MCD) slumped in premarket US trading on Tuesday after the Centers for Disease Control and Prevention said E. coli infections linked to the burger giant's "Quarter Pounder" offering had led to 49 cases,