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Carolyn Duff, president of the National Association of School Nurses, which worked on the guidelines, said many schools may not have policies on food allergies. “And if they do, maybe the policies aren’t really comprehensive,” she said.

Rep. Nita M. Lowey, a New York Democrat who worked on the law that led to the guidelines, said in a statement that they are a big step toward giving parents “the confidence that their children will stay safe and healthy at school.”