The U.S. Food and Drug Administration (FDA) is working together with the Centers for Disease Control and Prevention (CDC) in collaboration with state and local partners to investigate illnesses in a multi-state outbreak of Listeria monocytogenes infections.

A deadly listeria outbreak linked to frozen supplement shakes has spread across 21 states, leaving 12 dead and 38 hospitalized, prompting an FDA investigation and nationwide recall.

A nationwide recall has been issued for frozen nutritional shakes linked to a deadly listeria outbreak, according to the Food and Drug Administration. The shakes were sold to hospitals and long-term care institutions, including nursing homes.

Prairie Farms Dairy has ceased production of nutritional shakes linked to a listeria outbreak that has claimed the lives of 11 people.

At least one more death has been reported in connection to a listeria outbreak linked to frozen supplemental shakes.

Supplemental shakes have been linked to a deadly listeria outbreak. They were distributed in hospitals and long-term care facilities.

CLEVELAND, Ohio – Supplemental shakes that might have been contaminated with Listeria monocytogenes have been recalled. Lyons Magnus recalled the 4-ounce cartons of Lyons ReadyCare and Sysco Imperial frozen shakes after the products’ manufacturer, Prairie Farms Dairy Inc., recalled them from its Fort Wayne, Indiana, facility.

A listeria outbreak linked to frozen nutritional milkshakes is to blame for 12 deaths and dozens of hospitalizations, the U.S. Food and Drug Administration confirmed Monday following an investigation that spanned years.

In the outbreak, 38 people were infected across 21 states, including Pennsylvania, the FDA said. Most of them lived in long-term care facilities or were hospitalized prior to getting sick.

The supplemental shakes are labeled under the brands Lyons ReadyCare and Sysco Imperial and were sold to institutional customers, including hospitals and long-term care facilities, officials said.