U.S. health officials have announced a recall of some Boar's Head liverwurst and other deli meats as they investigate a listeria outbreak.

Boar’s Head Provisions Co. recalled liverwurst because it may be tainted with the listeria bacteria, the U.S. Agriculture Department said. The agency said a sample of Boar’s Head liverwurst from a Maryland store tested positive for listeria.

The company is also recalling deli-sliced meats made the same day on the same line as the contaminated liverwurst at a Virginia plant, the USDA said. The sample was from an unopened package, collected by health officials as part of an investigation into the listeria outbreak.