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The FDA is investigating a deadly listeria outbreak linked to Lyons ReadyCare and Sysco Imperial frozen shakes, resulting in 11 deaths and 37 hospitalizations across 20 states.

Investigators suspect nutritional shakes manufactured by a Prairie Farms Dairy, Inc. facility in Fort Wayne are responsible for a listeria outbreak that has killed 12.

The FDA says an onsite investigation at Prairie Farms Dairy revealed three environmental swabs taken in the processing area tested positive for listeria monocytogenes.

A listeria outbreak tied to frozen shakes served in hospitals and long-term care facilities has sickened at least 38 people and killed 12, according to the U.S. Food and Drug Administration (FDA). The shakes,

The recalled products were distributed nationwide, including to hospitals and long-term care facilities. The outbreak has sickened 38 people.

A total of 38 listeria monocytogenes infections have been reported in New York, California and about 20 other states, according to the FDA.

At least one more death has been reported in connection to a listeria outbreak linked to frozen supplemental shakes.