(Harrisburg) -- The owner of the Chambersburg farm that's been linked to 38 cases of a common bacterial infection is apologizing to customers on the dairy's website. Edwin Shank, of The Family Cow in Franklin County, says testing conducted by the Maryland Department of Health and Mental Hygiene has confirmed Campylobacter bacteria was present in the farm's raw milk produced last month. Shank says he and his family are "humiliated" and "embarrassed" and the farm will refund any raw milk products with a "best buy" date in January. He urges anyone who's become ill as a result of consuming the milk to contact the farm. The state Health Department says of the 25 people affected in the midstate, 18 cases are concentrated in Franklin County. Four people in Maryland, two in West Virginia, and one in New Jersey have also been stricken with the illness. The infection has affected people from ages two to 74, while the median age of those who have fallen ill is 26 years old. Nearly half of the cases occurred in people younger than 18. Customers who've contracted the infection reported symptoms, including nausea, vomiting, and diarrhea, from January 18th to the 28th. The Pennsylvania Agriculture Department has also tested the milk, while the state Health Department is working to locate anyone who's become ill.

*This post has been updated from an earlier version.