OIE: Low pathogenic avian influenza (poultry,H7N3), United States of America

Information received on 24/03/2020 from Dr Mark Davidson, Associate Administrator, USDA-APHIS, United States Department of Agriculture, Washington, United States of America
Summary
Report type Follow-up report No. 1
Date of start of the event 10/03/2020
Date of confirmation of the event 12/03/2020
Report date 24/03/2020
Date submitted to OIE 24/03/2020
Reason for notification Recurrence of a listed disease
Date of previous occurrence 30/08/2019
Manifestation of disease Clinical disease
Causal agent Low 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 (16/03/2020)
Follow-up report No. 1 (24/03/2020)
New outbreaks (8)
Outbreak 1 Union County, Union, North Carolina
Date of start of the outbreak 13/03/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 16989 16989 0
Affected population Commercial turkey meat flock
Outbreak 2 Anson County, Anson, North Carolina
Date of start of the outbreak 13/03/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 24068 24068 0
Affected population Commercial turkey meat flock
Outbreak 3 Union County, Union, North Carolina
Date of start of the outbreak 13/03/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 11612 11612 0
Affected population Commercial turkey meat flock
Outbreak 4 Union County, Union, North Carolina
Date of start of the outbreak 13/03/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 17877 17877 0
Affected population Commercial turkey meat flock
Outbreak 5 Chesterfield County, Chesterfield, South Carolina
Date of start of the outbreak 13/03/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 36649 36649 0
Affected population Commercial turkey meat flock
Outbreak 6 Union County, Union, North Carolina
Date of start of the outbreak 15/03/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 15590 15590 0
Affected population Commercial turkey breeder flock
Outbreak 7 Union County, Union, North Carolina
Date of start of the outbreak 16/03/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 20070 20070 0
Affected population Commercial turkey meat flock
Outbreak 8 Union County, Union, North Carolina
Date of start of the outbreak 19/03/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 45974 45974 0
Affected population Commercial turkey meat flock
Summary of outbreaks Total outbreaks: 8
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 188829 ** 188829 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Birds ** ** ** **
*Removed from the susceptible population through death, destruction and/or slaughter
**Not calculated because of missing information
Epidemiology
Source of the outbreak(s) or origin of infection
  • Unknown or inconclusive
Epidemiological comments 24 Mar 2020 Update--Surveillance testing for H5/H7 Avian Influenza has identified H7N3 low pathogenic avian influenza (LPAI) in commercial turkey meat flocks at an additional 3 premises in North Carolina and 1 premises in South Carolina. H7 LPAI was also confirmed in 1 commercial turkey breeder and 3 other turkey meat flocks in North Carolina. No clinical signs have been observed in these recently identified flocks. Affected premises for this event total 11. All confirmed positive premises have been depopulated and disposal is ongoing. The USDA Animal Plant Health Inspection Service (APHIS) and Departments of Agriculture in affected states continue enhanced surveillance and testing as well as a comprehensive epidemiological investigation.
Control measures
Measures applied
  • Movement control inside the country
  • Surveillance within containment and/or protection zone
  • Quarantine
  • Zoning
  • Vaccination prohibited
  • No treatment of affected animals
Measures to be applied
  • Disinfection
Diagnostic test results
Laboratory name and type Species Test Test date Result
National Veterinary Services Laboratories (National laboratory) Birds gene sequencing 17/03/2020 Positive
National Veterinary Services Laboratories (National laboratory) Birds gene sequencing 23/03/2020 Positive
National Veterinary Services Laboratories (National laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 17/03/2020 Positive
National Veterinary Services Laboratories (National laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 21/03/2020 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.