Mechanically tenderized beef
caused at least five E. coli O157:H7 outbreaks between 2003 and 2009, causing 174 illnesses, one of them fatal, according to the national Centers for Disease Control and Prevention. The first documented outbreak in 2003 was traced to blade-tenderized, marinade-injected frozen filet mignon steaks consumers cooked at home, resulting in 13 illnesses that landed seven people in the hospital. (The process is also called "blading" or "needling." Costco, for instance, labels the mechanically tenderized beef it sells as "blade tenderized.")
The process can drive bacteria like the E. coli O157:H7 from the surface deep into the center of the meat, where they are harder to kill. That can increase the risk of illness for people who eat that beef rare or medium rare.
Even though it’s not mandatory yet to label meat that has been mechanically tenderized, some retailers in the U.S. and Canada are starting to provide labels voluntarily. A proposed labeling laws is currently under review.
Make sure your restaurant staff can answer questions about mechanically tenderized beef and ensure that it is cooked to 155 degrees Fahrenheit or above. For more information go to fda.gov and search for mechanically tenderized beef.