PORTLAND, OR -- Chipotle restaurants will reopen Wednesday in Oregon and Washington, after an E.Coli outbreak that sickened over 40 people.

Dr. Paul Cieslak with the Oregon Health Authority tells KBND News the chain has been more than cooperative in following health officials' recommendations and there is no ongoing risk. "We recommended that they go in and clean and sanitize all the stores, that they interview all their employees for illness and exclude any employees who might be ill, that they do some retraining and they’ve taken all these steps." They've also tested food for restocking and adopted new safety procedures. 

Dr. Cieslak says despite the investigation, they were not able to nail down the source of the E.Coli contamination because there were too many ingredients in too many different entrees. "Almost all of the people, for example, had eaten jalapeno peppers in some form, or red onions in some form; and we couldn't tease apart all of the different items and say 'this is the one that did it.'" Voluntary tests conducted by the restaurant and approved by the OHA also came back negative.