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

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.

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.

Business At least 75 people are sickened as the deadly McDonald’s E. coli outbreak expands Early information analyzed by the FDA showed that uncooked slivered onions used on the burgers “are a ...

McDonald's growth in U.S. sales was driven by $5 Meal Deals. It doesn't expect an E. coli outbreak tied to Quarter Pounders to impact its performance.

An 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 have now ...

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.

About 50 people have fallen ill in the McDonald’s outbreak, and one has died, according to the CDC.

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.

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 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.