The text explains the National Outbreak Reporting System (NORS), a surveillance system used in the United States to collect and analyze data about disease outbreaks. It describes how health departments report outbreaks caused by food, water, person-to-person contact, environmental exposure, or unknown sources. The system helps public health authorities monitor trends, identify causes of outbreaks, and improve prevention strategies. By gathering and sharing outbreak information, NORS supports better responses to public health threats and helps reduce the spread of infectious diseases.