Skip directly to search Skip directly to A to Z list Skip directly to navigation Skip directly to page options Skip directly to site content

Reporting and Surveillance for Norovirus


Currently, state, local, and territorial health departments are not required to report individual cases of norovirus illness to a national surveillance system. We may not know about many cases because most hospitals and doctor’s offices do not test for norovirus.

If you suspect an outbreak of norovirus in your community, please contact your state or local health department. Find your state contact.

Health care providers should report all outbreaks of acute gastroenteritis, including suspected outbreaks of norovirus, to the appropriate state, local, or territorial health department.

Health departments are encouraged to report all suspected and confirmed norovirus outbreaks through the National Outbreak Reporting System (NORS) and CaliciNet.

Surveillance Systems


The National Outbreak Reporting System (NORS) was launched by CDC in 2009 to collect information on outbreaks of foodborne, waterborne, and enteric (gastrointestinal) disease that spread from person-to-person, animals, environmental surfaces, and other or unknown ways. Public health agencies can report all outbreaks of gastroenteritis, including norovirus illness, through this web-based system.

NORS Dashboard is a web-based tool for searching and accessing data from NORS. It has useful graphics that make data easy to visualize. NORS Dashboard helps you learn about reports of outbreaks of foodborne, waterborne, and enteric diseases spread by person-to-person contact, environmental contamination, animal contact, and other means.


CaliciNet is a national norovirus laboratory surveillance network of federal, state, and local public health laboratories in the United States. CDC launched CaliciNet in 2009 to collect information on norovirus genotypes associated with gastroenteritis outbreaks in the United States.


CDC established the Norovirus Sentinel Testing and Tracking (NoroSTAT) network in August 2012 for enhanced surveillance of norovirus outbreaks. NoroSTAT is a collaborative network of nine state health departments and CDC working together to establish and maintain standard practices for norovirus outbreak reporting to CDC surveillance systems. NoroSTAT combines NORS and CaliciNet data.

Other Surveillance Systems

In addition to collecting norovirus outbreak data from state and local health departments, CDC is using the following platforms to generate estimates of norovirus illness and monitor trends over time.

  • New Vaccine Surveillance Network (NVSN) includes study sites that conduct active, population-based surveillance for hospitalizations and outpatient visits associated with acute gastroenteritis in children, as well as surveillance for acute respiratory illness.
  • Foodborne Diseases Active Surveillance Network (FoodNet) is an active surveillance system that collects data on laboratory-confirmed cases of foodborne illnesses, monitors trends in incidence of specific foodborne illnesses over time, attributes illnesses to specific foods and settings, and disseminates this information.
  • SUPERNOVVA is a surveillance network of five Veteran’s Affairs Medical Centers (VAMCs) that are located throughout the United States. The network tests for various pathogens that cause acute gastroenteritis or acute respiratory illness. This system detects cases and outbreaks in participating VAMCs. This system is useful in collecting information on norovirus among older adults.