In 2007 Public health officials from several states collaborated to determine the source of the outbreak, and the Centers for Disease Control and Prevention (CDC) officially announced that a Salmonella serotype I 4,5,12:i:-* outbreak had been traced to the consumption of ConAgra pot pies on October 9th. At the time, ConAgra did not initiate a recall.
The CDC report summarized the results of the investigation, which determined that 401 cases of salmonellosis occurred in 41 states during 2007, with 32% of ill persons hospitalized. In October 2007 the illnesses were finally associated with consumption of Banquet® brand frozen, not-ready-to-eat pot pies. Further investigation determined that 77% of patients who ate these pies cooked them in microwave ovens and that consumer confusion regarding microwaving instructions might have resulted in a failure to cook the product properly.