Listeria monocytogenes was found on equipment surfaces on the production line at the Bakersfield, Calif. plant where the products are made, Nestle said.

Her favorite case involved an episode of food poisoning that she helped tie to a sausage contaminated with the Listeria monocytogenes bacterium.

Still, its presence is seen as an indicator for the probable presence of Listeria monocytogenes, the FDA said.