The E. coli outbreak at McDonald's has ended, according to the CDC.

• The deadly E. coli outbreak linked to slivered onions served at McDonald's has ended, according to the Centers for Disease Control and Prevention.
• The CDC said 104 people in 14 states were infected in the outbreak.
• The agency first announced the outbreak on Oct. 22.

The deadly E. coli outbreak linked to slivered onions served at Chipotle Mexican Grill is over, more than a month after the Centers for Disease Control and Prevention began its investigation.

In the outbreak, 104 individuals in 14 states were infected, resulting in 27 hospitalizations and the death of an older adult in Colorado.

The CDC identified fresh slivered onions served on Quarter Pounders and other menu items as the likely source of the outbreak, which was first announced by the agency on Oct. 22.

McDonald's generates billions of dollars annually from Quarter Pounder hamburgers, which are a staple on their menu. Despite temporarily removing them from some locations due to an outbreak, the burgers have since been reinstated.

Despite the end of the outbreak, McDonald's continues to struggle with sales decline.

On November 18, 2020, the foot traffic to its U.S. restaurants decreased by 6.6% compared to the same day the previous year, according to a research note from Gordon Haskett. This represents an improvement from the seven-day rolling average of 11% traffic declines recorded on October 29, 2020.

The CDC first linked 10 states to the outbreak, and these states experienced a combined fall of 9.5% in traffic on Nov. 18, according to the note.

The company is reportedly planning to invest more than $100 million in marketing and financial assistance for affected franchisees.

McDonald's is reintroducing its popular McRib, starting Tuesday, after a "farewell tour" last year. Additionally, the chain will launch a new McValue menu in January to attract customers seeking affordable options.

Since the CDC linked McDonald's Quarter Pounders to the outbreak, shares of the company have fallen 7%. Its market cap is $209.6 billion.