Federal regulators are determining the cause of the outbreak. Here's what you should know about E. coli.

A deadly outbreak of E. coli poisoning tied to McDonald’s Quarter Pounders has expanded, with at least 75 people sick in 13 states, federal health officials said Friday. A total of 22 people ...

Dozens of people across 13 states have become sick after eating McDonald’s Quarter Pounders contaminated with E. coli. At least 75 people fell ill from the bacterial infection and one person ...

A deadly outbreak of E. coli poisoning tied to McDonald’s Quarter Pounders has expanded, with at least 75 people sick in 13 states, federal health officials said Friday.

The U.S. Food and Drug Administration says the E. coli outbreak linked to McDonald's Quarter Pounders has expanded to 90 cases, with 27 hospitalizations and one death.

A deadly outbreak of E. coli poisoning tied to McDonald's Quarter Pounders has expanded, with at least 75 people sick in 13 states, federal health officials said Friday.

The number of people reported being sick or hospitalized in the E. coli outbreak linked to McDonald's Quarter Pounder hamburgers has increased, the CDC said Friday.

At least 75 sickened as deadly McDonald’s E. coli outbreak expands No source of the E. coli outbreak has been identified, but officials are focused on slivered onions used on the burgers.

The McDonald’s E. coli outbreak tied to Quarter Pounders has expanded: At least 75 people have been sickened in 13 states, the CDC said Friday.