Story highlights The CDC has traced the origins of a batch of raw milk that caused two people to fall ill

Listeria was linked to an organic farm in Pennsylvania

(CNN) A listeria outbreak from two years ago has been traced to raw milk from an organic farm, the Centers for Disease Control and Prevention said Friday.

The CDC released a report on Friday that said raw milk produced by Miller's Organic Farm in Pennsylvania tested positive for listeria

The bacteria causes listeriosis, an infection that affects the gastrointestinal tract. This serious infection can cause problems such as a high fever, diarrhea and a host of other symptoms. In some cases, it can result in death.

The CDC began investigating Miller's Organic Farm after it determined the farm was the source of the 2014 listeria outbreak. Two people, one in California and another in Florida, contracted the illness after their families stated they drank raw milk.

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