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

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.

Twelve deaths have been reported as part of an outbreak of Listeria monocytogenes infections linked to frozen supplemental shakes, the US Food and Drug Administration said Monday. At least 38 people in 21 states had been infected,

The frozen shakes were served at hospitals and long-term care facilities, sickening 38 people and resulting in 11 deaths in 21 states, according to the FDA.

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.

The Food and Drug Administration is investigating a possible link between frozen supplemental shakes and a deadly listeria outbreak. The now-recalled shakes are typically sold to hospitals and nursing homes,

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

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

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.