reduction of diacetyl in butter-like flavorings, such as those used in popcorn, due to cases of the potentially fatal disease bronchiolitis obliterans or "Popcorn Workers's Lung" appearing among plant workers exposed to diacetyl fumes, as well as in one case that involved a popcorn consumer. The next day ConAgra Foods announced that it would soon remove diacetyl from its Jiffy Pop and Orville Redenbacher's popcorn products. 2007 Salmonella outbreak On October 11, 2007, Conagra asked stores to pull the Banquet and generic brand chicken and turkey pot pies due to 152 cases of Salmonella poisoning in 31 states being linked to the consumption of Conagra pot pies, with 20 people hospitalized. At that time, both the USDA and Conagra decided in favor of a consumer advisory and against a recall. ConAgra said the issue stemmed from pies not being cooked thoroughly in older microwaves, and that the package's heating instructions would be changed to reflect different microwaves. However, the plant in Marshall, Missouri, where the pot pies were manufactured closed on October 11 as well. By October 12, a full recall was announced, affecting all varieties of frozen pot pies sold under the brands Banquet, Albertson's, Food Lion, Great Value, Hill Country Fare, Kirkwood, Kroger, Meijer, and Western Family. The recalled pot pies included all varieties in 7-oz. single-serving packages bearing the number P-9 or "Est. 1059" printed on the side of the package. By October 14, 174 cases of Salmonella poisoning in 32 states were linked to consumption of the contaminated ConAgra pot pies, with 33 people hospitalized. Public interest groups criticized Conagra for the delay in issuing the recall, a decision which Conagra defended by saying the recall was a precaution. At the time of the recall, the USDA had still not identified the source of the Salmonella contamination. On October 17, the Colorado Department of Public Health reported that "An investigation by the Centers for Disease Control and Prevention and state public health departments involved a large cluster of illnesses caused by Salmonella that identified these products" and stated that, "Nationally, at least 211 individuals from 35 states have become ill." From January 1 through December 31, 2007, the CDC identified a total of 401 cases in 41 states. 2009 Slim Jim plant explosion On June 9, 2009, at 11:27 am ET, an explosion rocked the Slim Jim manufacturing plant in Garner, North Carolina resulting in the