According to the FDA, the contamination was discovered by the company during “internal testing of their products.”

Freeze-dried fruit packs sold at Sam’s Club are being recalled in 43 states due to possible listeria contamination. Customers urged not to eat them.

Listeria monocytogenes [is] an organism which can cause serious and sometimes fatal infections in young children, frail or elderly people, and others with weakened immune systems," the FDA said.