Less than a week after announcing a 21.7 million pound recall of ground beef, Topps Meat closed its doors.

The recall, one of the largest beef recalls in U.S. history, was initiated because the meat was potentially contaminated with E. coli. It was the first recall for the company, founded 67 years ago.

Although only 87 employees officially worked for Topps, it was considered one of the largest suppliers of frozen hamburger patties in the country. Ten of the employees will stay on to assist the USDA in its investigation, the company said.

Thirty people are believed to have become sick from eating Topps’ meat, although none have died.

Commentary: You can’t get a more blatant example of why quality controls are a necessity.