At Tuesday's teleconference, FDA officials said that four strains of salmonella have now been linked to the Georgia plant in the current outbreak.
Only one strain, salmonella Typhimurium, was to blame for the contamination that has sickened more than 500 people and possibly contributed to eight deaths.
The strain was found in tubs of peanut butter in Minnesota and Connecticut and in peanut butter crackers in Canada, according to Dr. Robert Tauxe, deputy director of the CDC's division of foodborne, bacterial and mycotic diseases in the National Center for Zoonotic Vectorborne and Enteric Diseases.
But a second strain of salmonella was found in cracks in the floor of the plant, a third in a container of peanut butter from the plant, and a fourth strain was found in peanut butter in the plant, Tauxe said. No cases of salmonella infection have resulted from the latter three strains, Tauxe added.
According to the AP, Peanut Corp. issued a statement Tuesday that said: "PCA has cooperated fully with the FDA from day one during the course of this investigation. We have shared with them every record that they have asked for that is in our possession, and we will continue to do so."
While jars of peanut butter on store shelves appear to be safe, more than 300 peanut butter and peanut paste products from more than 40 companies have been recalled so far.
And Tauxe said he expected the list of recalled products to continue to grow.
Peanut Corp., which originally recalled all peanut butter and peanut paste produced at the Georgia plant since July 1, 2008, sells directly to institutions, food se
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