Federal investigators have linked at least three different kinds of E. coli to Nestle's cookie dough but were not able to determine how the products got affected, according to ABC News.

The FDA confirmed that the genetic fingerprint of the E. coli found at the plant is different than E. coli that has been linked to a 30-state outbreak that has left at least six dozen people.

Sources told ABC news that a new strain of E. coli was found in dough recovered from the home of a victim, meaning at least three different types of E. coli have been found in cookie dough made by Nestle.

Last month, the FDA found E. coli 0157 in a 16-ounce refrigerated chocolate-chip cookie dough bar while inspecting the Danville plant.

The investigation is winding up. It is not exactly over yet, said Dr. David Acheson, the assistant commissioner for food safety. But we have not figured out the likely ingredient.