Chipotle is in hot water, as 24 people have become sick after eating at the chain.
The company has already shut down all restaurants in Seattle and Portland after a reported outbreak of E. coli. While only six Chipotle locations have been linked to the outbreak, the company told the Associated Press that all restaurants have been closed "out of an abundance of caution."
After news of the health scare hit, shares at the company fell by as much as 7% in pre-market trading. They're down 3% today.
This isn't the first time the burrito chain known for its fresh products has faced the consequences of major food poisoning outbreaks, with outbreaks of salmonella and norovirus earlier this year.
Here are five times in the last seven years Chipotle has dealt with similar sickening situations, as tracked by the Food Poison Journal and the Foodborne Illness Outbreak Database.
1. Minnesota, 2015
In August, approximately 64 people were sickened after eating tomatoes served at Chipotle locations in Minnesota.
Twenty two Chipotle locations were linked to the outbreak. Immediately following reports of salmonella, all Chipotle restaurants in Minnesota swapped out the offending tomatoes to those from a different supplier, but did not close.
2. California, 2015
A single Simi Valley, Calif. Chipotle location infected about eighty customers and 17 employees with norovirus on August 18 and 19.
The location was temporarily closed after customers reported the outbreak. Health inspectors said that the Chipotle in question contained dirty and inoperative equipment, equipment directly connected to the sewer, and other sanitary and health violations.
While E. coli and salmonella are often linked to supplier issues, norovirus infections are usually connected to infected employees preparing food.
Mallory Schlossberg/Business Insider
3. Six states serving iceberg lettuce, 2009
When patients in Colorado, Utah, and New York state all became infected with the same strain of E. coli, the common link was the consumption of Chipotle's iceberg lettuce.
A Chipotle lettuce supplier, Church Brothers, LLC, was ultimately found to be responsible for infections in Colorado, Utah, New York, North Carolina, South Dakota, and Wisconsin in September 2009. A total of 29 customers were infected in the outbreak.
4. Ohio, 2008
In April 2008, more than 500 people became ill after eating at a Chipotle location near Kent State University in Kent, Ohio.
A norovirus outbreak hit the location at an especially inopportune time, as Chipotle coupons had recently been given out in exchange for donating blood. Activists pointed to the outbreak, which was rumored to have been linked to an infectious employee, as evidence of the necessity of providing paid sick days and discouraging ill employees from showing up to work.
5. California, 2008
More than 20 people who ate at a Chipotle in La Mesa, Calif. in March and April 2008 developed hepatitis A.
No source for the outbreak was definitely determined, but a number of customers filed lawsuits against Chipotle following their illnesses. The virus is highly contagious, and is usually spread in the US from contact with food or drinks contaminated with feces of an infected person.