Cases have been reported in 21 states, including California, Connecticut, Florida, Illinois, Michigan, and more. The affected shakes were sold primarily to long-term care facilities. Lyons Magnus LLC has voluntarily recalled the shakes,

Here is what you need to know about the deadly listeria outbreak, including which products are being recalled.

Two Connecticut residents were infected by listeria connected to the supplemental milkshakes, but have since recovered.

A listeria outbreak linked to frozen nutritional milkshakes is to blame for 12 deaths and dozens of hospitalizations, the U.S. Food and Drug Administration confirmed Monday following an investigation that spanned years.