Centers for Disease Control and Prevention. National Notifiable Diseases Surveillance System (NNDSS). Last updated May 4, 2015. Available at: wwwn.cdc.gov/nndss.
The county or state health department will try to find the source of many of these illnesses, such as food poisoning. In the case of sexually-transmitted diseases (STDs) the county or state will try to locate sexual contacts of infected people to make sure they are disease-free or are treated if they are already infected.
- Mandatory written reporting. A report of the disease must be made in writing. Examples are gonorrhea and salmonellosis.
- Mandatory reporting by telephone.The provider must make a report by phone. Examples are rubeola (measles) and pertussis (whooping cough).
- Report of total number of cases. Examples are chickenpox and influenza.
- Cancer. Cancer cases are reported to the state Cancer Registry.