"Fruitland American Meat ... is defending itself, saying the finding is based on a clerical error." (Via NBC)

According to the USDA, "The problem may have occurred as a result of the way some company employees were recording information and determining the age of various cattle ... Dorsal root ganglia ... must be removed from cattle 30 months of age and older."

This is a class 2 recall, meaning there is a "remote" possibility of harmful heath effects. So far, no cases of mad cow disease from this incident have been reported, and Missouri heath officials are working to make sure all tainted meat is disposed of. (Via KMOV)

People can contract the potentially deadly disease by consuming the diseased beef. According toWebMD, the disease can be hard to diagnose in humans. Symptoms include issues with the nervous system like loss of coordination, depression and dementia. It's usually fatal within 13 months.