Federal health agencies closed their investigations into the bacterial outbreak that sickened 104 people and was linked to onions on the fast-food chain’s signature Quarter Pounders.

An E. coli outbreak that hit McDonald's Corp. is over, the U.S. Centers for Disease Control and Prevention said.

The CDC and FDA have closed their investigations into an E. coli outbreak linked to McDonald's Quarter Pounder hamburgers after determining there is no longer a safety risk.