Recalled supplemental shakes were distributed to hospitals and long-term care facilities nationwide, federal officials say.

Frozen shakes distributed in long-term facilities around the United States have been recalled due to potential listeria contamination. Lyons Magnus announced Feb. 22 that it had issued a recall for 4 oz. Lyons ReadyCare and Sysco Imperial Frozen Supplemental Shakes, which were manufactured by Prairie Farms Dairy, Inc.

An ongoing listeria outbreak credited with 11 deaths is linked to frozen supplemental shakes. Here’s what you should know: The shakes, sold in 4-ounce cartons under the brands Lyons ReadyCare and Sysco Imperial, were made by Prairie Farms Dairy at its Fort Wayne, Indiana, facility.

The FDA announced that a food distributor is recalling all ReadyCare and Sysco Imperial Frozen Supplemental shakes, typically sold to long-term care facilities, over listeria concerns.

Frozen supplemental shakes sold to hospitals and long-term care facilities in 21 states, including Florida, are making people sick and already have led to 12 deaths.

A Listeria outbreak linked to recalled frozen shakes has killed 11 people, raising concerns about food safety oversight in nursing homes and hospitals.