Roast beef and ham distributed to Walmart delis all over the country and used to make sandwiches has been recalled because it might be tainted with the potentially harmful bacteria known as Listeria, according to the U.S. Department of Agriculture.

It hasn’t been made completely and publicly clear how many Walmarts sold the meat products. A retail sample collected in Georgia tested positive for Listeria, which can cause serious and sometimes fatal infections in young children or elderly people, or those with weakened immune systems.

The products being recalled were all labeled as Marketside Grab and Go Sandwiches.

They included Black Forest Ham With Natural Juices Coated with Caramel Color; Hot Ham, Hard Salami, Pepperoni, Sandwich Peppers; Virginia Brand Ham With Natural Juices, Made in New York, Fully Cooked Bacon, Sandwich Pickles, Sandwich Peppers; and Angus Roast Beef Coated with Caramel Color.