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 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 outbreak has infected 38 individuals, 37 of whom have been hospitalized, and 12 who have died A listeria outbreak linked to recalled frozen shakes has left 12 people dead, according to the U.S. Food and Drug Administration (FDA).