Add Yahoo as a preferred source to see more of our stories on Google. An E. coli outbreak linked to McDonald's Quarter Pounder burgers has caused illnesses in at least 49 people across 10 states, ...

E. coli outbreaks are fairly common, with an estimated 265,000 illnesses and 100 deaths each year in the US. But this bacteria, and the illness they cause, aren't something to take lightly. The most ...