Kellogg Co. announced will pull immunity claims from its Rice Krispies and Cocoa Krispies cereal boxes amid the public's growing concern about swine flu. Kellogg began adding extra antioxidants to its cereal last year, which it says help support the immune system. The company began advertising the change with large labels on cereal boxes that read in bold letters: "Now helps support your child's immunity." But representatives from the food maker said that given the public attention to swine flu, it has decided to phase out the message from its packages.