UPDATE: February 1, 2016 at 5:21 p.m.

In its final update of the multi-state E. coli disaster linked to Chipotle, the Centers for Disease Control (CDC) has deemed the outbreak officially over. Unfortunately, the government agency and the chain have still not figured out the source of the bacteria.

Federal authorities told the New York Times that they investigated two E. coli STEC 026 outbreaks, which spread to 14 states total and sickened 60 people. Of those 60, 22 even required hospitalization. In its official statement, the CDC expressed that while it believes a common ingredient is likely the cause of contamination, investigators could not identify which ingredient that might be. "When a restaurant serves foods with several ingredients that are mixed or cooked together and then used in multiple menu items, it can be more difficult for epidemiological studies to identity the specific ingredient that is contaminated," the statement said.

So while the CDC's announcement gives you a sort of go-ahead to eat at the Tex-Mex chain again, the "we're not sure what happened" caveat remains unsettling. Chipotle's spokesman, Chris Arnold, continues to reassure customers: "Over the past few months we have taken significant steps to improve the safety of all of the food we serve," he told the Times. "And we are confident that the changes we have made mean that every item on our menu is delicious and safe." 

UPDATE: December 4, 2015 at 4:38 p.m.: Chipotle has not been getting the best rep recently, from closing 43 stores after an E. coli investigation this November and then being caught trying to cover up another e. coli outbreak earlier this year, but things are about to get even worse for the Mexican chain. According to US News, the number of states affected by this outbreak has been bumped up from six states to nine states.

On Friday, the Center for Disease Control and Prevention stated that seven additional people in Illinois, Maryland, and Pennsylvania have contracted E. coli. According to the CDC, 47 out of the 52 people infected claimed they ate at a Chipotle restaurant in the week preceding their illness. 

Despite this, it is still unclear which ingredient in the food is making people sick. While Chipotle said that it has been testing its ingredients, the chain is now beginning to test smaller batches and a larger number of samples. It has also been said that no ingredients suspected to be involved with the outbreak still remain in stores. 

The company stated, "In testing for pathogens, in many ways you're looking for needles in haystacks. Through this high resolution testing programs, we are making the haystacks smaller by working with smaller lots." 

ORIGINAL POST: November 20, 2015 at 5:24 p.m.

An outbreak of E. coli linked to Chipotle that originated in the Pacific Northwest has spread south and east and has now infected people in six states.

New cases have been reported in California, New York, and Ohio, the Centers for Disease Control and Prevention (CDC) said Friday. The first cases were discovered late last month in Oregon and Washington, and more recently in Minnesota.

Investigators yet to determine the specific ingredient linked to the illness.

So far, 45 people have been infected, with 43 of them saying they ate at Chipotle in the week before they became sick. The CDC said it is aware of illnesses starting on dates ranging from Oct. 19 to Nov. 8. The agency said that illnesses that took place after Oct. 31 may not have been reported yet.

Chipotle Mexican Grill closed 43 restaurants in Oregon and Washington in late October after health officials discovered most of the people sickened in the outbreak had eaten at its restaurants. The restaurants have since reopened.

"At the moment, we do not believe that it is necessary to close any restaurants," Chipotle spokesman Chris Arnold said in an email. He said the company has taken measures including deep cleaning in restaurants, replacing ingredients and providing supply chain data to investigators.

Chipotle, based in Denver, has more than 1,900 locations and has gained popularity by touting the freshness and quality of its ingredients. Earlier this year, the company ran into trouble after suspending a pork supplier that violated its animal welfare standards. That led to a shortage of carnitas at hundreds of locations around the country, which the company said dampened its sales growth ...

Chipotle said affected individuals reported eating at two restaurants in Turlock, CA; one in Akron, OH; one in Amherst, NY and one in Burnsville, MN. The company said it is not aware of any employees who have become ill.

Bill Marler, a Seattle attorney representing people who have been sickened, said the spread of the outbreak will make it easier to determine the source.

"It helps investigators link up to a perishable item," Marler said. "What they're really focusing on right now is the supply chain. What's the common denominator? Who supplied what product to these stores?"

Of those sickened, two have been in California, two in Minnesota, one in New York, one in Ohio, 13 in Oregon and 26 in Washington, according to the CDC. Sixteen people have been hospitalized, but there have been no deaths, the agency said.

So much for those food-safety consulting firms Chipotle hired. 

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