McDonald’s worked Wednesday to reassure customers that its U.S. restaurants are safe as federal investigators tried to pinpoint the cause of a deadly E. coli outbreak linked to the fast food giant’s Quarter Pounder hamburgers. (AP video by Thomas Peipert)

Deadly E. coli outbreak linked to McDonald’s Quarter Pounders

McDonald’s worked Wednesday to reassure customers that its U.S. restaurants are safe as federal investigators tried to pinpoint the cause of a deadly E. coli outbreak linked to the fast food giant’s Quarter Pounder hamburgers. (AP video by Thomas Peipert)