McDonald’s says supplier Taylor Farms is source of onions linked to E. Coli outbreak NBC NewsFirst lawsuit filed against McDonald’s over its E. coli outbreak CNNFDA investigates onion supplier in McDonald’s E. coli outbreak NBC NewsOnions Recalled in Deadly E.Coli Outbreaks Linked to McDonald’s Quarter Pounders The New York TimesUh, Should You Worry About McDonald’s Because of the Whole E. Coli Thing? Slate