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Although it was originally thought that only the jars of Peter Pan peanut butter with product code beginning with 2111 was affected, FDA is advising consumers that ALL Peter Pan peanut butter purchased since May 2006 is affected; only those jars of Great Value peanut butter purchased since May 2006 with a product code beginning with "2111" are affected.

To date, the Great Value peanut butter with the specified product code has not been linked by CDC to the cases of Salmonella infection; however, the produce is manufactured in the same plant as Peter Pan peanut butter. Therefore, FDA believes that the peanut butter is at the same risk of contamination. Great Value peanut butter made by manufacturers other than ConAgra is not affected.

http://www.fda.gov/bbs/topics/NEWS/2007/NEW01565.html