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

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.

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