McDonald’s says an E. coli outbreak which sickened dozens of people in the United States has been contained, allowing the production of Quarter Pounders to resume. Sales in affected states are expected to resume in the next week. Cesar Piña, chief supply chain officer at McDonald’s in North America, said the Quarter Pounder patties had been ruled out as the source of the outbreak, which is known to have killed at least one person. “The issue appears to be contained to a particular ingredient and geography, and we remain very confident that any contaminated product related to this outbreak has …