A deadly food poisoning outbreak has led to the recall of more than 7 million pounds of popular Boar’s Head deli meats made at a plant in Virginia.

U.S. health officials are investigating the outbreak of the bacteria listeria that began in May. Two people have died and nearly three dozen were hospitalized in 13 states.

Listeria poisoning is caused by a particularly resilient type of bacteria that can survive and grow even during refrigeration, according to the Centers for Disease…