(Harrisburg) -- The state Health department has confirmed more cases of a bacterial infection that's being linked to raw milk from a midstate farm. A dozen people, including eight Pennsylvanians and four from Maryland, have become ill from Campylobacter bacteria found in raw milk from The Family Cow farm store in Chambersburg, Franklin County. Six cases were originally reported. Doctor Stephen Ostroff, the agency's acting physician general, says raw milk runs the risk of being unsafe. "The pasteurization step itself markedly reduces the likelihood of there being any bacteria in the finished product, and so raw milk, by itself, is never considered to be as safe as pasteurized milk," he says. Ostroff says the elderly, young children, and people with compromised immune systems should not consume raw milk. Symptoms of Campylobacter infection include diarrhea, abdominal cramping, vomiting, and fever. The department is still looking for people who've been infected by the bacteria. Most cases in the commonwealth have occurred in the midstate.