Listeria Outbreak Linked to Frozen Shakes Kills 14, Sickens 42 Across 21 States

A multistate outbreak of Listeria monocytogenes linked to frozen supplemental shakes produced by Prairie Farms Dairy and distributed under the Lyons ReadyCare and Sysco Imperial brands has resulted in 42 illnesses and 14 deaths across 21 states. The outbreak, primarily affecting residents of long-term care facilities, was investigated by the CDC and FDA beginning in 2018 with sporadic cases until the source was identified in 2025 through environmental sampling at Prairie Farms. Lyons Magnus LLC voluntarily recalled the implicated 4-ounce frozen shakes with best-by dates from February 2025 to February 2026, and no recalled products should currently be available on the market. The outbreak strain was confirmed via whole genome sequencing from environmental swabs collected during an FDA inspection of the manufacturing facility. Most affected individuals were hospitalized, and the true number of cases is likely higher since some may have recovered without testing. The investigation has officially ended after confirming the frozen supplement shakes as the source of the deadly outbreak.