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How is flu activity tracked in the United States?

Flu activity in the United States is tracked by the Epidemiology and Prevention Branch in the Influenza Division at the Centers for Disease Control and Prevention (CDC). This agency collects, compiles and analyzes information on year-round influenza activity in the United States. It produces FluView, a weekly influenza surveillance report, and FluView Interactive, which allows for more in-depth exploration of flu surveillance data. The U.S. influenza surveillance system is a collaborative effort between the CDC and its many partners in state, local and territorial health departments, public health and clinical laboratories, vital statistics offices, healthcare providers, clinics and emergency departments. Information in five categories collected from eight different data sources allows the CDC to: 

  • Find out when and where influenza activity is occurring
  • Track influenza-related illness
  • Determine what flu viruses are spreading
  • Detect changes in influenza viruses
  • Measure the impact the flu is having on hospitalizations and deaths in the United States

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.