A deadly E. coli outbreak linked to slivered onions on McDonald's Quarter Pounder burgers has sickened 104 people in 14 states, federal health officials said in an update on Wednesday.

The number of illnesses in the E. coli outbreak linked to McDonald’s Quarter Pounders has risen to 104, up from 90 at last count, health officials said in an update Wednesday. To date, 34 people ...

The fallout from the E. coli outbreak at McDonald’s has been worse than expected, said Cleveland Research, and late October/November comparable sales were much softer than early estimates after ...

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.

McDonald’s shares plunged as much as 6% Wednesday after an outbreak of E. coli that sickened almost 50 people and killed one was linked to the Golden Arches’ famous Quarter Pounder hamburgers.

O’Leary Ventures chairman Kevin O'Leary warns that McDonald's should tell the public all available information regarding its E. coli outbreak and that "everything gets out" eventually.

The result was learned on Dec. 20 as the E. coli test takes 18 hours to process. The Army said this sample was taken at the water well source before the water chlorination treatment station.

The E. coli strain found within Melanie, O157:H7, was the same strain found in contaminated iceberg lettuce from Taylor Farms California that sickened at least 69 people from 10 states.