In January 2012, raw milk from the Family Cow dairy in Chambersburg, Pa., sickened 148 people across four states.

It demonstrates the ongoing hazards of unpasteurized dairy products, according to a new study pubished in the journal Clinical Infectious Diseases. Read the study here.

While it might be possible to reduce the risks associated with unpasteurized milk consumption with further testing, consumers can never be assured that certified unpasteurized milk is pathogen-free, even when from a seemingly well-functioning dairy, the study said. “The only way to prevent unpasteurized milk-associated disease outbreaks is for consumers to refrain from consuming unpasteurized milk."

Read more from the Food Poisoning Bulletin.

Douglas Powell, professor of food safety at Kansas State University, told NBC News that raw milk is “riskier than most foods.”

"Fecal matter just ends up in the milk — it's not like you can see it," he said. "No inspectors can see it — this isn't CSI, where the bacteria just magically line up."

See, “Raw milk sickened scores, even with oversight, report finds.”