The frozen supplemental drinks have been linked to an outbreak of listeria that has killed at least 11 people and hospitalized 37.

An outbreak of listeria infections linked with frozen supplemental shakes has made at least 38 people ill in 21 states, with 37 hospitalizations and 11 deaths, the US Food and Drug Administration said Friday.

The supplemental shakes are labeled under the brands Lyons ReadyCare and Sysco Imperial and were sold to institutional customers, including hospitals and long-term care facilities, officials said.