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How to Investigate

Unexplained Respiratory Disease Outbreaks (URDO)

The purpose of this website is to provide background, guidance, and resources to state and local health departments, as well as other public health professionals, to assist in the investigation of a cluster or outbreak of respiratory infections of unknown etiology. Learn more >>

NOTE: If you are not a health professional and are looking for general public resources, see Recent Outbreaks & Incidents.

Resources for Public Health Investigators

Contact Us:
  • Centers for Disease Control and Prevention
    1600 Clifton Rd
    Atlanta, GA 30333
  • 800-CDC-INFO
    (800-232-4636)
    TTY: (888) 232-6348
    24 Hours/Every Day
  • cdcinfo@cdc.gov
USA.gov: The U.S. Government's Official Web PortalDepartment of Health and Human Services
Centers for Disease Control and Prevention   1600 Clifton Rd. Atlanta, GA 30333, USA
800-CDC-INFO (800-232-4636) TTY: (888) 232-6348, 24 Hours/Every Day - cdcinfo@cdc.gov

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