Listeria detected in raw milk from Middleburg area dairy

HARRISBURG – Consumers who purchased raw milk from Greenfield Dairy, 1450 Tittle Road, Middleburg, should discard it immediately due to possible Listeria monocytogenes contamination, according to a press release from the Pennsylvania Department of Agriculture.

The release indicates raw milk collected during required routine sampling by a commercial laboratory on April 8 tested positive for the bacteria.

Greenfield Dairy, owned by Paul Weaver, sells directly to consumers at an on-farm retail store. The packaged raw milk is sold under the Greenfield Dairy label in half gallon glass containers dated April 18, 21, 22 and 24.

Agriculture officials have ordered Weaver to stop the sale of all raw milk until further notice. Two samples taken at least 24 hours apart must test negative before the farm can resume raw milk sales.

Raw milk is milk that has not been pasteurized.

Pennsylvania law allows farms to sell raw milk but requires the farms to be permitted and inspected by the agriculture department to reduce health risks associated with unpasteurized products. There are 175 farms in Pennsylvania permitted to sell raw milk or raw milk cheese.

Symptoms of listeriosis usually appear in one to three weeks, but can appear in as little as three days or as many as 70 days after consumption. Symptoms include fever, muscle aches and gastrointestinal symptoms such as nausea or diarrhea. If the infection spreads to the nervous system, symptoms such as headache, stiff neck, confusion, loss of balance or convulsions can occur.

Infected pregnant women may experience only a mild, flu-like illness, but infections during pregnancy can lead to miscarriage or stillbirth.

To date, the Pennsylvania Health Department is not aware of any illnesses related to these products. Any person who consumed raw milk from Greenfield Dairy and has symptoms should consult their physician, visit their local state health center or call (877) 724-3258. For more information about listeriosis, visit