Highly pathogenic avian influenza,
United States of America
Information received on 16/04/2020 from Dr Mark Davidson, Associate Administrator, USDA-APHIS, United States Department of Agriculture, Washington, United States of America
Report type Follow-up report No. 1
Date of start of the event 06/04/2020
Date of confirmation of the event 08/04/2020
Report date 16/04/2020
Date submitted to OIE 16/04/2020
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 High pathogenic avian influenza
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 16 Apr 2020 Update--Low pathogenic avian influenza (LPAI) H7 of North American wild bird origin was confirmed (positive results from real-time reverse transcriptase polymerase chain reaction testing and gene sequencing at the National Veterinary Services Laboratories) on 9 Apr 2020 in barns on the same commercial meat-type turkey premises in Chesterfield County, South Carolina where Highly pathogenic avian influenza (HPAI) was detected on 8 Apr 2020. No clinical signs were observed. Due to the HPAI H7N3 detection, all birds on the premises had been depopulated on 8 Apr 2020 and disposal was completed on 11 Apr 2020. The USDA Animal Plant Health Inspection Service (APHIS) and South Carolina State Veterinarianís Office, part of Clemson University Livestock Poultry Health (CULPH), continue conducting a comprehensive epidemiological investigation and enhanced surveillance, including targeted network surveillance, in the area. The South Carolina Department of Health and Environmental Control (DHEC) Division of Acute Disease Epidemiology (DADE) has been engaged in the response to address public health concerns.
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
  • Vaccination prohibited
  • No treatment of affected animals
Measures to be applied
  • Disinfection
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.