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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 FDA says an onsite investigation at Prairie Farms Dairy revealed three environmental swabs taken in the processing area tested positive for listeria monocytogenes.

A listeria outbreak tied to frozen shakes served in hospitals and long-term care facilities has sickened at least 38 people and killed 12, according to the U.S. Food and Drug Administration (FDA). The shakes,

Cartons of frozen shakes sold to nursing homes and other institutions are being recalled after an outbreak of listeria linked to the products. The U.S. Food and Drug Administration says the supplemental shakes are labeled under the brands Lyons ReadyCare and Sysco Imperial and sold to institutional customers,

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.

The recalled products were distributed nationwide, including to hospitals and long-term care facilities. The outbreak has sickened 38 people.

A deadly listeria outbreak has resulted in a recall of frozen supplemental shakes used at long-term care facilities. The shakes were made by Prairie Farms Dairy Inc. based in Fort Wayne, Indiana, and were sold under the brands of Lyons ReadyCare and Sysco Imperial, the Food and Drug Administration.

Frozen supplemental shakes have been linked to a nationwide Listeria outbreak that have led to 38 illnesses and 12 deaths.

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