Beginning in August and September 2008, a few, sporadic cases of Salmonella Typhimurium started to appear on the CDC PulseNet radar screen. This was not unexpected, as numerous cases will exist at any given time throughout any given year. Through October and November 2008, however, the number of cases believed to be associated with this pathogen began to increase. Using Pulse-Field Gel Electrophoresis (“PFGE”) testing of culture-confirmed isolates (taken from various stool samples), the CDC determined that many of the newly-reported cases appeared to be related. In turn, these findings led to the first national case-control study, conducted on January 3 and 4, 2009, associated with the outbreak (learn how food-borne outbreaks are tracked).
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According to the CDC, preliminary analysis of the study led investigators to suspect that peanut butter was a likely source of the outbreak. Following the preliminary findings, the Minnesota Department of Agriculture then began testing various peanut butter products, and eventually reported it had isolated the outbreak strain from an open 5-pound container of King Nut creamy peanut butter. On January 10, 2009, after test results were shared with King Nut, it immediately initiated the first voluntary recall of peanut butter in the investigation. Soon thereafter, the Connecticut Department of Public Health reported that it had isolated salmonella from an unopened 5-pound container of King Nut peanut butter. According to officials in Connecticut, the salmonella found in the container also appeared, by PFGE, to match the outbreak strain.
Relying on trace-back efforts, investigators discovered that the King Nut peanut butter at issue was manufactured by the Peanut Corporation of America (PCA) in Blakely, Georgia. These preliminary findings prompted PCA, on January 13, 2009, to initiate the second voluntarily recall in the investigation - this recall included various peanut butter and paste products produced at the facility after July 1, 2008 (as additional information was developed and shared by investigators, this initial recall was later expanded on two occasions). Although these products were not sold directly to consumers, they had been distributed to numerous institutions, food service providers, food manufacturers and distributors. In turn, because some of these products were also reportedly used, in part, as ingredients in other products (including cookies, crackers, cereal, candy, ice cream, pet treats, and other foods), additional precautionary recalls followed. The following list outlines the progression of the subsequent voluntary and precautionary recalls (and, some expanded recalls), as industry worked very closely with the CDC and FDA to determine what raw materials and products could potentially be affected:
Friday, January 16, 2009:
Saturday, January 17, 2009:
Sunday, January 18, 2009:
Monday, January 19, 2009:
Tuesday, January 20, 2009:
Wednesday, January 21, 2009:
Thursday, January 22, 2009:
Friday, January 23, 2009:
Saturday, January 24, 2009:
Although the list of precautionary recalls has been extensive (and could still increase as new information is discovered and shared by investigators), it is important to recognize that all of the recalls were voluntary, and most were precautionary. Although many of the recalled products likely did not carry the bacteria at issue, most recalls were nevertheless announced in an abundance of caution because, at the very least, the possibility was there. Additionally, as to those samples in which the pathogen was isolated, there is a good chance that the bacteria was not evenly distributed; thus impacting only limited products, but not others. For this reason, all parties will need to wait for the investigation to conclude to determine whether only a very few or potentially more of these products actually carried trace elements of the pathogen at issue.
Additionally, as an aside, you may recall that we reported (early on) that at least one American staple - Girl Scout Cookies - was not in any way associated with the ongoing outbreak and recalls. To learn more about additional products not implicated, please visit the American Peanut Council, which has published a (still growing) list of peanut butter products and brands NOT affected in any way be the current recall.
In the coming days, we will of course continue to watch and report as this investigation winds down. We anticipate this will likely be soon, as illnesses associated with the outbreak appear, at this point, to be declining. For this and many other reasons, we also once again express our gratitude to both industry and public health officials, scattered throughout the country, working collectively to bring this outbreak and investigation to its closure.