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CDC is collaborating with public health officials in Pennsylvania and other state health departments and the US Food and Drug Administration to investigate a multi-state outbreak of Salmonella serotype Schwarzengrund infections in humans. These human illnesses have been linked with dry pet food produced by Mars Petcare US at a single manufacturing facility in Pennsylvania. People who think they might have become ill after contact with dry pet food or with an animal that has eaten dry pet food should consult their health-care providers.