Health officials said the source of contamination was likely slivered onions served on Quarter Pounder burgers.

McDonald’s is spending $100 million on marketing and to help franchises most heavily affected by a recent E. coli outbreak ...

At least 104 people have been sickened, with 34 hospitalized, in an outbreak of E. coli food poisoning tied to onions served ...

coli across 10 US states have sickened almost 50 and killed an elderly person in Colorado, stemming from infections linked to McDonald’s Quarter Pounder burgers ... within 3-4 days of ...

coli outbreak that has sickened 49 people across 10 states, with most cases involving McDonald’s Quarter Pounder burgers. To date ... people in Colorado (26), Nebraska (9), Utah (4), Wyoming (4), ...

While a specific ingredient has not been confirmed as the source of the outbreak, "most sick people report eating McDonald’s Quarter Pounder burger," the ... takes 3 to 4 weeks to determine ...

McDonald's pulled the Quarter Pounder burger from menus in several states ... 5 each in New Mexico and Utah, 4 each in Missouri and Wyoming, two in Michigan and one each in Iowa, Kansas ...

On Tuesday, the CDC reported 49 illnesses in 10 states, including the death of an adult in Colorado linked to the burgers ... slivered onions and quarter-pound beef patties in several states.

The CDC urges those who ate a quarter pounder from McDonalds and have severe symptoms of E. coli to contact a healthcare provider. Symptoms of E. coli start 3 to 4 days after ingesting the bacteria.