An E. coli outbreak affecting 90 people has been linked to McDonald's Quarter Pounders, according to the CDC.

• The CDC reported that 90 individuals in 13 different states have been infected in a lethal E. coli outbreak linked to McDonald's Quarter Pounders.
• One older adult has died and 27 people have been hospitalized due to the outbreak in Colorado.
• The risk to the public is "very low" because McDonald's and Taylor Farms have removed slivered onions from affected locations.

The Centers for Disease Control and Prevention announced on Wednesday that 90 individuals in 13 states have been infected in a deadly E. coli outbreak linked to Quarter Pounders. The investigation into the source of the spread continues.

One older adult has died and 27 people have been hospitalized due to the outbreak in Colorado.

The CDC last updated the outbreak on Friday, stating 75 cases in 13 states. The outbreak was first announced on Oct. 22.

The CDC stated on its website on Wednesday that the likely source of the outbreak is the fresh slivered onions served on Quarter Pounders and other menu items at McDonald's.

The CDC believes the risk to the public is "very low" due to the efforts of McDonald's and Taylor Farms to remove the ingredient from affected locations.

The probability of onions contaminated with bacteria remaining in stores is low, according to the agency.

McDonald's generates billions of dollars annually from Quarter Pounder hamburgers, which are a staple on their menu. On Sunday, the fast-food giant announced that the burgers will be reintroduced to approximately 3,000 U.S. restaurants this week, following their removal due to an outbreak.

In the near future, around 900 locations will not serve Quarter Pounders with slivered onions due to ongoing investigation into the source of the outbreak. This change will affect restaurants in Colorado, Kansas, Wyoming, Idaho, Iowa, Missouri, Montana, Nebraska, Nevada, New Mexico, Oklahoma, and Utah.