In this Tuesday, Nov. 3, 2015, file photo, a microbiologist points out an isolated E. coli growth on an agar plate from a patient specimen at the Washington State Dept. of Health in Shoreline, Wash.

(Bloomberg) — The U.S. Centers for Disease Control and Prevention has concluded its investigation into two E. coli outbreaks that sickened dozens of Chipotle Mexican Grill Inc. customers and thrust the chain into a crisis that wiped out more than $10 billion in market value.

The CDC was unable to determine the source of contamination but said it was probably a common meal item or ingredient. Chipotle shares rose on the news, as investors bet that the worst was over for the company after almost three months of negative headlines.

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