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,

An ongoing Listeria outbreak has mostly affected people living in long-term care facilities and people who were already hospitalized prior to becoming sick from the infection.

A range of frozen milkshakes have been recalled after they were linked to 11 deaths and dozens of serious illnesses, many of them in long-term care homes and hospitals, the FDA confirmed on Friday.