SALT LAKE CITY (AP) — A weeks-old baked potato was blamed for a botulism outbreak at a Utah prison where inmates drank alcohol brewed in cells, the Centers for Disease Control and Prevention said.

The outbreak sickened eight maximum-security inmates at the state prison in Salt Lake County on October 2011, making it the largest incident of botulism tied to prison-made brew, often referred to as “pruno,” the CDC said in a report released last week.