By Lynne Adkins

CHAMBERSBURG, Pa. (CBS) — Pennsylvania health officials are investigating the possible contamination of unpasteurized milk that may have sickened a dozen people in Pennsylvania and Maryland.

Pennsylvania health officials are looking into an outbreak of bacteria called Campylobacter, which has been linked to raw milk.

Dr. Stephen Ostroff, the acting physician-general of Pennsylvania, says a dozen people have been sickened; all said they consumed raw milk sold under the “Your Family Cow” label.

Ostroff says the farm is cooperating and has stopped production.  In addition, he says, “We are recommending that anyone who has this product since January 1st should discard it, or if they are ill should make sure they alert their health care provider to look for this particular infection.”

Signs of infection include nausea, vomiting, abdominal pains, diarrhea, and fever.

The milk is from a farm in Chambersburg, southcentral Pennsylvania, but is sold in the Philadelphia area.