Back to Nature Foods Co., a Wisconsin firm owned by Kraft Foods Inc., issued a nationwide recall Wednesday on its Nantucket Blend trail mix because some of the pistachio nuts tested positive for Salmonella.

And the pistachios came from a supplier to the Georgia Nut Company, which found the Salmonella through its own testing.

The press release from the U.S. Food and Drug Administration said,

This possible contamination is not connected with the recent outbreak associated with peanuts or peanut butter and no cases of Salmonellosis have been reported in connection with the recall.

Back to Nature Foods products are sold in Chicago area Dominick’s, Jewel, Target, Wal-mart, Whole Foods, Wild Oats, Hy-Vee, Kroger, Meijer and Woodman’s stores, as well as at military commissaries.

Casey did a quick search and found there have been no Salmonella outbreaks or reported positives associated with pistachios, although 2006 Good Agricultural Practice documents suggest limiting exposure of pistachios to irrigation water and carefully handling on-farm manure because of the possibility of microbial contaminants. It appears there’s a widespread belief that the hull protects the edible parts, and drying and roasting further mitigate risks of contamination, although the GAP document and research on other nuts has concluded such assumptions remain unverified.