Although salmonella was found at the plant, it's not yet known whether it's the same strain behind the outbreak, Sundlof said, adding that testing continues.
Sundlof said the FDA doesn't know all the peanut butter brands or foods containing peanut butter that might be affected. "We don't have specific information about what brands or products consumers should avoid," he said.
He added, however, that popular brands of peanut butter found on store shelves don't seem to be affected.
But AP, quoting consumer representatives who took part in an earlier-Friday conference call with federal officials, said companies producing products with peanut butter were being asked to consider halting sales.
The concern is that peanut paste is used in dozens of products, from baked goods to cooking sauces. Initially, federal and state investigators had focused on bulk containers of peanut butter sold to institutions such as nursing homes, but not to supermarkets, the AP said.
"Now it turns out, it's not just institutions," said Michael Hansen, a senior scientist with Consumers Union.
On Wednesday, Kellogg, of Battle Creek, Mich., said it hadn't received any complaints or discovered any problems with its crackers, but took the stop-sale action as a "precautionary measure" after Peanut Corp., one of its suppliers, announced a nationwide recall of peanut butter made at the Georgia plant.
The crackers are Toasted Peanut Butter Sandwich Crackers, Peanut Butter and Jelly Sandwich Crackers, Cheese and Peanut Butter Sandwich Cracker
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