Highly pathogenic avian influenza,
United States of America
Information received on 05/08/2020 from Dr Mark Davidson, Associate Administrator, USDA-APHIS, United States Department of Agriculture, Washington, United States of America
Report type Follow-up report No. 8 (Final report)
Date of start of the event 06/04/2020
Date of confirmation of the event 08/04/2020
Report date 05/08/2020
Date submitted to OIE 05/08/2020
Date event resolved 28/05/2020
Reason for notification Recurrence of a listed disease
Date of previous occurrence 11/08/2017
Manifestation of disease Clinical disease
Causal agent Highly pathogenic avian influenza virus
Serotype H7N3
Nature of diagnosis Laboratory (advanced)
This event pertains to a defined zone within the country
Related reports Immediate notification (09/04/2020)
Follow-up report No. 1 (16/04/2020)
Follow-up report No. 2 (24/04/2020)
Follow-up report No. 3 (30/04/2020)
Follow-up report No. 4 (07/05/2020)
Follow-up report No. 5 (15/05/2020)
Follow-up report No. 6 (21/05/2020)
Follow-up report No. 7 (05/06/2020)
Follow-up report No. 8 (05/08/2020)
Outbreaks There are no new outbreaks in this report
Source of the outbreak(s) or origin of infection
  • Unknown or inconclusive
Epidemiological comments 5 Aug 2020 update: The USDA Animal and Plant Health Inspection Service (APHIS) and South Carolina State Veterinarian’s Office, part of Clemson University Livestock Poultry Health (CULPH) responded swiftly to the single case of HPAI H7N3 and conducted a comprehensive epidemiological investigation of this incident. The last and only confirmed detection of HPAI H7N3 in poultry was made on April 8, 2020. In addition to having no further HPAI detections, the state of South Carolina has met the following: • Mandatory surveillance in the State and control areas has been completed with negative results for HPAI. As a precaution, additional enhanced surveillance and procedures may continue in the State and area. • Depopulation of the infected premises has been completed and appropriate disposal was completed. • Cleaning and disinfection of the infected premises (including, but not limited to, outside areas, equipment, trucks, and other fomites) has been completed. • All routine and enhanced surveillance samples have tested negative for avian influenza. No HPAI has been detected in over 3 months. The H7N3 HPAI incident in South Carolina is now final, closed, and resolved.
Control measures
Measures applied
  • Movement control inside the country
  • Surveillance outside containment and/or protection zone
  • Surveillance within containment and/or protection zone
  • Quarantine
  • Official disposal of carcasses, by-products and waste
  • Stamping out
  • Zoning
  • Disinfection
  • Vaccination prohibited
  • No treatment of affected animals
Measures to be applied
  • No other measures
Future Reporting
The event is resolved. No more reports will be submitted.