The U.S. Food and Drug Administration and the Centers for Disease Control and Prevention said on Monday the agencies were investigating a multi-state outbreak of listeria infections linked to frozen supplemental shakes manufactured by Prairie Farms Dairy Inc.

The outbreak is the second one in less than a year to infect Florida residents. Ten people, including one from Florida, died and 60 were hospitalized in 2024 leading to a recall of Boar’s Head luncheon meat. It was the largest listeria outbreak since 2011.

Here is what you need to know about the deadly listeria outbreak, including which products are being recalled.

Investigators suspect nutritional shakes manufactured by a Prairie Farms Dairy Inc. facility in Fort Wayne are responsible for a listeria outbreak that has killed 12.